The sleepwalker

An alarm sounds in the middle of the night for a burglary in progress at a winter-closed campsite in Bredäng, outside Stockholm. The nearest police car answers the call. There is a light in one of the farthest caravans and when the officers open the door they are horrified. Floors, walls and furniture covered in blood. A man has been brutally dismembered. On the floor of one of the rooms lies a young man sleeping with a severed arm as a pillow. He is arrested and taken to Kronoberg prison, identified as 17-year-old Hugo Sand, the son of a famous writer. It turns out that Hugo suffers from an unusual kind of somnambulism that is activated by nightmares. He can either be a perpetrator or a witness, but claims himself that he remembers nothing from the night. Detective Joona Linna, who is connected to the case, contacts Erik Maria Bark to use hypnosis to try to find out what happened inside the caravan.