Sickan, the leader of the criminal Jönsson gang is incarcerated in a mental institution, attended by Dr M.A. Busé, who admire a handbook in crime that Sickan has been writing. Blackmailed by the nefarious banker Wall-Enberg, Dr Busé and Sickan's partners Vanheden and Dynamite-Harry execute Sickan's plan of stealing the valuable Black Diamond of the Romanovs from the National Museum.
Ulf Brunnberg | Vanheden |
Björn Gustafson | Dynamit-Harry |
Peter Haber | M.A. Busé |
Birgitta Andersson | Doris |
Per Grundén | Wall-Enberg |
Elias Ringquist | Lillis |
Weiron Holmberg | Biffen |
Björn Granath | Lohman |
Pontus Gustafsson | Andersson |
Bernt Lindqvist | polischef |
Lena T. Hansson | Busés sekreterare |
Rikard Wolff | Romanoff |