Warning Signs

Hardback Published on: 12/02/2026
Price: £18.99
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Bookseller Reviews

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Warning Signs
A chilling mountain mystery
Wonderfully chilling, ‘Warning Signs’ is a haunting thriller told from the perspective of a troubled twelve year old boy. A brilliant take on monsters and ... READ MORE
Emma

Synopsis

DISCOVER THE THRILLER EVERYONE CAN’T PUT DOWN

‘This is a book that sticks in your head long after the last page’ LISA JEWELL
'An extraordinary double-whammy of a novel' LINWOOD BARCLAY
'An attention-commanding thriller. Buy it, lock your doors and shut off your phone' JEFFEREY DEAVER
'Knife-edge tension and a perfect denouement' ANDREA MARA
'Once you start reading, you won’t want to stop' ALEX FINLAY

---

There’s something out there in the darkness.
By morning, bones lie in the snow, picked clean.

Zach knows the moods of the mountains – his mother taught him before she was gone. His father and the other men on the ski weekend think they know better though.

Drinking and boasting, they laugh in the face of the icy conditions.

But Zach understands what danger looks like. Can he survive the wilderness, and all the monsters within it?

---

Praise for WARNING SIGNS

'Tracy Sierra is a master of edge-of-your-seat suspense' FLYNN BERRY
'Nobody does tension and terror like Tracy Sierra' HOLLY SEDDON
'Terrifying, chilling and emotionally visceral' NIKKI SMITH
'A taut survival thriller with heart' K.T. NGUYEN

Publisher information

  • Publisher: Penguin Books Ltd
  • ISBN: 9780241760918
  • Number of pages: 368
  • Dimensions: 241 x 163 x 34 mm
  • Weight: 572g
  • Languages: English

Customer Reviews

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Warning Signs
Chiller !
Wow - a chiller on so many levels !! A father and son ski trip turns into a nightmare for Zach 12 years old . Not only does he have to navigate the storm... READ MORE
Bookfiend
This reviewer received a free of charge product for review.
Warning Signs
Definitely a book to read in one sitting
It would be difficult not to get caught up in the ever-increasing tension of this story. The sheer scale, power and devastation of avalanches is staggering... READ MORE
J Robinson
Warning Signs
Loved the mountain setting
"Warning Signs" by Tracy Sierra is a highly entertaining novel about a group of men who go on a father and son ski trip organised by the father of the narr... READ MORE
Ciaran McLarnon
This reviewer received a free of charge product for review.
Warning Signs
Pages fly by
Warning Signs slowly draws you into the story of twelve year old Zach Fisher who's mother has made him and his siter super aware of danger signs that lurk ... READ MORE
Judy Odom
Warning Signs
Warning Signs by Tracy Sierra
Warning Signs by Tracy Sierra is the second novel by the author. The storyline is about a father and son, who go on a skiing trip together, which rather t... READ MORE
Christine Rennie
Warning Signs
Skiing will never be the same again
Every year Grace took Zach and Bonnie to the snow slopes. This year only Zach (12) is there, with his father, Brahm, because Grace is dead and little sist... READ MORE
Denis
Warning Signs
Another hit for Tracy Sierra
Nightwatching by Tracy Sierra was a Kindig Gem for 2024 for me, so I was excited to read her next book – Warning Signs. 12-year-old Zach is on a father/... READ MORE
KindigBlog
This reviewer received a free of charge product for review.
Warning Signs
Sometimes danger is close than you think
Zach, his sister Bonnie, and their mother often take trips up the mountains. She has taught them survival skills and most importantly what to do when there... READ MORE
Paula Sterling-stead
Warning Signs
Original and gripping
This is a book that grips as the plot builds and the tension ramps up It is hard to believe that it is told through the voice of a twelve year old, yet it ... READ MORE
barbara johnston
Warning Signs
An Exciting Read
Though at the beginning the story was very slow when it picked up it was exciting. Zach is 12 years old and goes on a Father and Son trip in the Colarado w... READ MORE
Chrissie Mortimer
Warning Signs
A Father Doesn't Always Know Best!
3.5 stars rounded up Twelve-year-old Zach is cautiously optimistic. His father Bran, whose business is in dire need of cash, has put together a father/s... READ MORE
Louise Wilson
Warning Signs
Tense uncomfortable thriller
Tracy Sierra is a queen of tension. With Warning Signs the tension was placed differently than within Nightwatching, this was more a slow burning tension ... READ MORE
Georgie M
This reviewer received a free of charge product for review.
Warning Signs
excellent
Tracy Sierra’s Warning Signs is a masterclass in atmospheric tension, where the snow-covered silence of the Colorado mountains becomes both sanctuary and t... READ MORE
Leanne H
This reviewer received a free of charge product for review.
Warning Signs
Terrifying Second Novel
I was worried when I started this book because I loved Nightwatching so much. The brilliance of that book meant that I had high expectations…but it was all... READ MORE
Kerry Young
This reviewer received a free of charge product for review.
Warning Signs
Interesting story
A slow burner but once I got into it I really enjoyed it. Interesting plot and characters and I liked the writing style. Thanks to the author, publishe... READ MORE
Maria  Hall
Warning Signs
A gripping read
This was such a gripping read - I loved it! The snow-bound setting was atmospheric and evocative, and the growing, collective sense of menace from the weat... READ MORE
jcmoore
Warning Signs
Chilling mountain survival
This book is quite slow in the beginning, but stick with it, it is worth the wait, by a quarter of the way through I was fully emersed and couldn't put it ... READ MORE
TrishAM
Warning Signs
Tense story that developed slowly
I read this book courtesy of NetGalley. A tense story which builds slowly. Set in the snowy mountains in the US with a group of business men and a coupl... READ MORE
Grey Lady
Warning Signs
What a book!
Warning Signs is a brilliantly plotted psychological thriller based in the Colorado mountains. Tracey Sierra wrings every ounce of suspense from the remote... READ MORE
Sam Whittaker
This reviewer received a free of charge product for review.
Warning Signs
Tense, suspenseful and claustrophobic
Tracy Sierra’s Warning Signs chilled me to my bones. Narrated by 12 year old Zach, all the characters we meet in this novel are seen through his eyes. Zach... READ MORE
Mary Picken
Warning Signs
A heart-thumpingly tense thriller about the fears closest to home …
Warning Signs by Tracy Sierra I couldn’t stop talking about Tracy Sierra’s debut novel Night Watching. I inhaled it and I have been lending and buying ... READ MORE
Hayley Baxter
This reviewer received a free of charge product for review.
Warning Signs
Avalanches incoming
Twelve-year-old Zach and his father, Bram, are on a father-son ski trip in the Colorado backcountry with some other men, taking advantage of an annual cabi... READ MORE
Laura
This reviewer received a free of charge product for review.
Warning Signs
Gloriously, edge of your seat, terrifying!
Another wow book from Tracy Sierra! After absolutely loving Nightwatching, I was excited to read Tracy’s new book. Where Nightwatching was pure nightmare h... READ MORE
Carrie Beth
This reviewer received a free of charge product for review.
Warning Signs
Compelling, addictive, and engrossing
Warning Signs‘ is one of those books where you can cut the tension with a knife from start to finish. There is an impending sense of doom, that feeling in ... READ MORE
Eva
This reviewer received a free of charge product for review.
Warning Signs
Warning Signs
Grace taught her children Zach and Bonnie, everything she knew about survival in the winter wilderness, the warning signs of avalanches, how to dig a shelt... READ MORE
Big Bertha
This reviewer received a free of charge product for review.
Warning Signs
Fab read!
This book didnt quite have me on the edge of the seat like Nightwatching which was utterly breathtaking but this had its moments. A 4 star read certainly a... READ MORE
hayley wiggins
This reviewer received a free of charge product for review.
Warning Signs
A skiing party facing life threatening weather conditions face an even greater menacing situation
A young boy highly skilled by his late mother in the arts of skiing on unforgiving terrain is forced to participate in a dangerous adventure with his uncom... READ MORE
George  Young
This reviewer received a free of charge product for review.
Warning Signs
Mountain Danger
Zach is a 12 year old boy; his late mother worked hard to teach him how to ski in the mountains, how to assess the risk of avalanche and how to stay safe a... READ MORE
Aidan Dunn
Warning Signs
intense
A new favourite thriller author? I prefer my books to be character-driven which is normally lacking in thrillers which relies on twists and unreliability. ... READ MORE
Caitlin Lloyd
This reviewer received a free of charge product for review.
Warning Signs
Enjoyable atmospheric novel
Another well written and atmospheric novel from the author of Nightwatching.. The plot follows tragic events surrounding a father and son skiing expedition... READ MORE
Steven Capel
Warning Signs
A thrilling roller-coaster read
I'm still reeling with shock at the power of this story, of Zach, a young lad of 11 trapped in a snowy Colorado wilderness with his controlling father and ... READ MORE
KarensBookBag
This reviewer received a free of charge product for review.
Warning Signs
Warning Signs.
Zach is on a hunting trip with his father and needs all his survival skills to survive. His father does not think that his twelve year old son is fit for ... READ MORE
Pauline S
Warning Signs
Five stars!
Warning Signs by Tracy Sierra is a tense and haunting book that grips you from the first page and refuses to let go. Told through the eyes of twelve-year-o... READ MORE
The Secret Book Review
Warning Signs
Filled with tension and suspense
Zach and his father, Bram, are taking part in a father-son weekend in the snowy Colorado mountains. Bram is keen to impress the business associates he's in... READ MORE
D Hart
This reviewer received a free of charge product for review.
Warning Signs
too much detail about mountain survival skills for me!
I really enjoyed Ms Sierra's first book "Nightwatching" and was looking forward to this one. It's certainly very different, set in the mountains during a f... READ MORE
jean
This reviewer received a free of charge product for review.
Warning Signs
Eerie, dark tale
Warning Signs is an incredibly powerful and emotional read. Experiencing the story through a child’s point of view made everything feel more intense and de... READ MORE
Rachel Beales
This reviewer received a free of charge product for review.
Warning Signs
Something is out there in the darkness… and it’s coming for you. ❄️
Terrifying from page one. “Warning Signs” had my heart racing and my skin tight with fear—I could feel the icy wind, hear the crunch of snow, and sense dan... READ MORE
CathV
This reviewer received a free of charge product for review.
Warning Signs
A tale of survival
Zachary and Bonnie are often taken into the snowy mountains by their mother Grace and taught useful lessons on survival, ones Zachary will find useful late... READ MORE
K MacLean
Warning Signs
A good thriller
3.5 rounded up Nightwatching is a superb novel which I read with baited breath and so there’s definitely a strong sense of anticipation with a new nove... READ MORE
Celia Short
This reviewer received a free of charge product for review.
Warning Signs
Best thriller I’ve read in a long time
I read this book in 28*C and felt the cold and snow as if I was there. It’s so exquisitely written that I had to keep looking at the palm trees to reassure... READ MORE
Carol Ellis
Warning Signs
Not as good as Nightwatching, but still a good story
Having read and loved Nightwatching, reading late into the night and totally feeling the panic I was excited to be offered Tracy Sierra's second book, Warn... READ MORE
Dana Farren
Warning Signs
A brilliant thriller on the mountain
Twelve-year-old Zach is forced into a ‘father and son’ skiing trip with a group of his father Bram’s would-be investors. Bram is a controlling and abusive ... READ MORE
Jade Boyd
This reviewer received a free of charge product for review.
Warning Signs
Atmospheric thriller
This is an atmospheric and unsettling thriller set in the Colorado wilderness. Twelve-year-old Zach’s ski trip with his father takes an unsettling turn whe... READ MORE
Danielle Conroy
This reviewer received a free of charge product for review.
Warning Signs
Snow, kids and murder
Well, what can I say, I loved this. It’s dark and suspenseful and it seems I have a penchant for stories narrated by kids. 12 year old Zach is on a skiing... READ MORE
Linda Lee
This reviewer received a free of charge product for review.
Warning Signs
Immersive well written story
I really enjoyed this immersive story about a 12 year old boy trying to survive a skiing trip with his narcissistic father, a murderer and a monster! Love... READ MORE
Sian Barkatt
This reviewer received a free of charge product for review.
Warning Signs
Tracy Sierra does it again
A father-son ski weekend with an ulterior motive. Zack has been taught to survive in these harsh conditions, but the adults are reckless, they've got somet... READ MORE
Faye Parry
This reviewer received a free of charge product for review.
Warning Signs
A slow burn that builds with the power of an avalanche
Zach, is a 12-year-old lad, who is on a father and son ski weekend, staying in a remote cabin with potential investors for his dad’s company. Bran, Zach’s... READ MORE
Lynsey (To read or not to read)
This reviewer received a free of charge product for review.
Warning Signs
Tense and thrilling
This author’s debut novel frightened me half to death when I started reading it alone in my house. I loved the immediate tension and the twisty plot in whi... READ MORE
Nicola Mackenzie-Smaller
This reviewer received a free of charge product for review.
Warning Signs
Enthralling
With many thanks to Netgalley for this free arc and I am leaving this unbiased review voluntarily.I was blown away by Tracy Sierra's Nightwatching and it w... READ MORE
Donna
This reviewer received a free of charge product for review.
Warning Signs
Monsters in the Snow
This is an ideal winter read in a safe and cosy corner. Told from the viewpoint of Zak a teenage boy, the skiing trip unfolds in an ominous tone. It become... READ MORE
Rachel Gallehawk
Warning Signs
A terrifying and tense story that’ll keep you page turning.
A slow build into a suddenly terrifying and tense story. It takes you into a lot of different situations from father and son relationships to domestic abus... READ MORE
SuzyCO