 De Cock is haunted by visions about his former colleague Frank van der Meulen, whose girlfriend committed suicide 15 years ago. Frank maintained it was murder and obsessively searched for a culprit, completely losing touch with reality. De Cock discovered that he has died of a heart attack, and has a hunch that there is foul play at hand. He illegally lets Den Koninghe perform an autopsy, enraging Buitendam, but turns out to be right. During the investigation he meets with all the people who were hurt by Frank s obsession- his wife, and the people he suspected of the murder. The visions continue, and De Cock thinks that Frank is trying to pass him clues from beyond the grave.