We begin on the Baltic Queen ferry just off the Finnish island of Aland. The water is a chilling 16ºC (60ºF) when a 36-year-old Estonian man falls overboard on Friday night. His absence is not discovered until the next day when the ferry docks. Security cameras show the man falling from the vessel and enable Finnish sea rescue to find him two hours later. Suffering from hypothermia, with a body temperature of 26º C (78ºF), he should be dead.