Two friends have their faith put to the test.

Grim tale of two scoot rangers ending up face to face with a masked killer.

Linda is a young psychology student, who wants to help his boyfriend Riku, who has fallen into a state of psychosis by taking him to a mystical cave, where human subconscious and memories start to live their own life. Linda soon realises that she can't help Riku, before she has faced her own most painful traumas.

In the middle of the summer holidays, the body of a drowned man with ligature marks on his wrists is recovered from Tammerkoski river. The investigation by Koskinen's team is further strained by the hit-and-run case of a dubious music manager and the mysterious Carl Friedrich. When a new body is found in Lake Näsijärvi, the connection between the victims is made clear.