Eleven-year-old Marin and her neighbor Charley hope that by preventing a disaster that occurred twenty years ago, they can save Charley's dad from a future of guilt and self-destructive behavior.

Emotionally crippled by his obsessive-compulsive disorder, teenager Matthew Corbin rarely leaves his room on a cul-de-sac in London, and he passes the day observing and writing down his neighbors doings from his window--and when a toddler staying next door disappears Matt is the key to solving a mystery and possibly saving a child's life--if he can manage to expose himself, and his secret guilt, to the outside world.