Robert B. Parker's Lullaby (A Spenser Mystery)

'I spotted the girl even before she knocked on my door.' Mattie Sullivan is not Spenser's typical client. For a start, she's just fourteen. Nor is her request a typical one - to take a case that's already been solved. But this kid is wiser than her years. And this case is less clear-cut, and far more dangerous, than it appears.