A hotel is set on fire in Nyborg, killing 32 people. A local pyromaniac, Henning Jørgensen, is taken into questioning, but fails to answer where the fire started. In a side story, a little boy witnesses how a bespectacled man places the corpse of a young woman on a bench in a parking lot. In a picture from the local newspaper, a face is very faintly viewed in the background, and the police trace the person in the picture to be Otto Lykke Larsen, a mentally retarded man. Larsen is taken into questioning. In the videos found in Larsen's apartment, fires are videotaped and Unit One suspects that Larsen was the pyromaniac responsible. In other videos, Larsen has sexual intercourse with a woman, Britt Hjort Jespersen. In questioning, Larsen admits that he was the one who set fire on the hotel, along with all the other fires recorded in his videotapes. In the mean time, the corpse of the young woman is identified as Jespersen. Larsen admits he killed Jespersen.

Just released from prison the entrepreneur called farmand (daddy-o) is found murdered in a Danish train to Århus, which puts the unit smack in the middle of hypnosis and crime and they meet one of the smartest criminals in the series so far. Kaare commits a robbery just after being released from State Prison in Horsens. He shoots three people and is arrested by Fischer. Unit One suspects that Ivan has masterminded the coup.

Bertel Kjeldsen calls Dahl late at night to ask her to come to Fredensborg where he allegedly killed his own wife. In the meantime, the case of Britt Hjort Jespersen is brought up again as a poor autopsy of the body wasn't satisfactory. DNA samples from a new autopsy show DNA from another man. Dahl tries hard to find Keldsen, who is standing at the edge of a tall building when Dahl finds him. He tells how he killed his wife and how his son, Knud Kjeldsen, killed Jespersen. Dahl arrests Knud. Knud lies under questioning, but the DNA samples show that Knud's biological brother, Robin Hansen, who is mentally retarded, was the murderer. Knud tried to cover for his retarded brother to spare his family.