How do you catch a killer - when you're just a kid? A teenage girl disappears from a beach town at the height of summer. Two months later a massive police search has gotten nowhere. And eleven-year-old Billy Wheatley steps in to solve the case. Billy's something of a child prodigy--or at least he thinks he is. He lives on a desolate clifftop with just his distant father for company. Plus the animals that live in the rockpools around him. But he's highly motivated, with his own reasons to want the police and coastguard off his beach. Using all of his particular ingenuity, Billy unravels the mystery. But what he discovers puts him in terrible danger. The person who took the girl is someone he knows, only too well. And when they learn that Billy is onto them They're going to need him dead.