The Woods by Harlan Coben

Twenty years ago, four teenagers disappeared in the woods at summer camp. Two decades later, everything changes...

Paul Copeland's sister was one of the missing teenagers. Now raising a daughter alone after the death of his wife, he balances family life with a career as a prosecutor. But when a body is found, the well-buried secrets of the past threaten everything.

Could the victim be one of the missing teenagers? Could his sister be alive? Copeland has to confront so much he left behind that summer twenty years ago: his first love, Lucy; his mother, who abandoned the family; and the secrets that his parents have been hiding ...