Twenty years ago, at night, four young people secretly left a summer camp into the forest. The police soon discovered two hastily buried bodies in a thicket. Two more - a boy and a girl - were never found either alive or dead. Detectives considered the crime to be the work of a maniac, whom they managed to catch and put behind bars. But was it really he who killed the teenagers? This question still torments prosecutor Paul Copeland, whose sister was that same girl who disappeared without a trace. And now, when the police find the body of a man who can be identified as the boy who disappeared twenty years ago, Paul intends to find the answer to this question at any cost. Perhaps his sister is alive. But he will be able to find her only if he reveals the secrets of the past and understands what really happened on that fateful summer night.