On a summer night, police recover the body of a young woman from an abandoned boat. The only explanation for her death is drowning, but all evidence makes a drowning impossible. The next day, a man turns up dead, hanging from the lamp hook in the ceiling. The obvious explanation would be a suicide, except the ceiling is too high and there was no furniture moved to climb up on. Detective Inspector Joona Linna begins to piece the two mysteries together, but the logistics are a mere prelude to a dizzying and dangerous course of events.

In this spellbinding international bestseller, a murder leaves only one route to the killer.