Criminal investigator Anders Olsen begins to solve an instance when two bank clerks are shot by a bank robber and runs in the streets of Copenhagen. When detained, he claims to have committed the offense alone. Some eyewitnesses say the robber seemed to have been in a trance, which makes the case odd and even more complicated. Olsen realizes that the accused has been in prison with the Schow Nielsen and begins to guess that Nielsen had hypnotized his inmate to commit the offense for him. But is it possible -- and if so, how do the perpetrator be caught? Olsen seeks help from a well-known psychiatrist in hypnosis, together with whom Olsen delves deeper in the sphere of mental manipulation. Absorbed from the investigation, Olsen will not see that the Nielsen has befriended his young wife. The instance rolls him nearer than he could have envisioned.