A Tap on the Window - Linwood Barclay

When Cal Weaver stops at red light on a rainy night while driving home, he ignores the bedraggled-looking teenaged girl trying to hitch a lift. Even when she starts tapping on his window. But when she says, 'hey, aren't you Scott's dad?' and he realizes she's one of his son's classmates, he can't really ignore her. OK, so giving a ride to a teenage girl might not be the smartest move, but how much harm could it do?

Over the next 24 hours Cal is about to find out. When the girl, Claire, asks to stop at a restroom on the way home, he's happy to oblige. But the girl who gets back in the car seems strangely nervous, and it's only when they get nearer their destination that Cal realizes she no longer has the nasty cut that he noticed on Claire's hand. After he's finally let her out of the car he remains puzzled and intrigued. But it's only the next morning that he starts to really worry. That's when the police cruiser turns up at his door and asks him if he gave a lift to a girl the previous night. A girl who has now been found brutally murdered.

If Cal is going to clear his name he's going to figure out what Claire was really up to and what part he played in her curious deception. But doing so will involve him in some of the small town of Griffon's most carefully kept secrets - and a conspiracy as bizarre as it is deadly.