Killing a Stranger — Jane A. Adams

The new Naomi Blake mystery - A teenage boy is found drowned in a canal, just hours after telling his mother that he killed a man. There seems to have been no link between them, and the boy was a model student, never in trouble with anyone. Naomis friend Patrick knew him, and when he turns to Naomi for help, it becomes clear that the case has complex, tragic roots in the past.