Did He Fall...?

Ben Denyer is an A-Level student, living with his aunt, uncle, and twin sister Tiffany in an old mansion called GreenHill Manor. He is convinced that a guest who fell downstairs six months ago was in fact pushed, and when all the suspects convene for another weekend party he is determined to expose the killer. Enlisting the help of best friend Jake, and using a manipulated recording of the dead man's voice, Ben sets a trap, but events overtake him when another death occurs. Is it really the suicide it first appears, or are they now facing a double homicide?