Four friends are spending the night at Lake Bodom, where unsolved murders took place many years ago. The young men are determined to venture into the dense forest to solve the mystery.

Haunted by his traumatic past and cautious about the prospects of an uncertain future, a fourteen year old boy named Juhani winds up in an isolated boys' home known as The Island. Juhani has been shuttled between foster homes and temporary families for the past six years, leaving any prospect of stability in his life a faded dream. When Juhani winds up in a remote shelter for troubled youth known as The Island, he has little idea of how ruthless superintendent Olavi Harjula can truly be.

Detective sergeant Timo Harjunpää of the Helsinki Violent Crime Unit loses his daughter in a tragic way. Despite the support of his closest colleague, Constable Onerva Nykänen, Harjunpää is unable to recover from the loss of his family. He seeks revenge against his daughter's killer, while in his work he investigates strange deaths in the Helsinki metro that turn out to be the work of a serial killer.