On an abandoned boat, a body's lungs are filled with water, and the forensics team is sure that she drowned. But why is the boat still afloat, and why are there no traces of water on her clothes or body? The next day, a man turns up dead in his apartment, hanging from the ceiling. All signs point to suicide, but there's no furniture around to reach the high ceiling. Joona Linna begins to piece together the two mysteries, but the logistics are a mere prelude to a dangerous course of events.