Eighteen-year-old Kristel survives a car accident in which her father dies. Tormented by nocturnal visions she continues her father's investigation of serial killers - especially Andries Martíns, a child killer. She decides to visit an abandoned mine, with a little group of friends from college, where her father headed the investigations on Andries. In the dark, abandoned mine shafts, convicted murderers used to be used as 'firefighters' to detect explosives, which was a job that normally nobody survived.