Director: Hans Åke Gabrielsson
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
Ragnar Vanheden
Björn Gustafson
Dynamit-Harry
Peter Haber
Dr. Max Adrian Busé
Birgitta Andersson
Doris
Elias Ringquist
Lillis
Björn Granath
Lohman
Pontus Gustafsson
Andersson
Bernt Lindqvist
The Chief of Police
Per Grundén
Wall-Enberg
Weiron Holmberg
Biffen Johansson
Lena T. Hansson
Busé's secretary
Rikard Wolff
Count Romanoff
Thomas Segerström
Guard
Jonas Uddenmyr
Guard
Karl Erik Andersen
Jailer
Ulf Eriksson
Patient
Sten Hellström
Patient
Jan Mybrand
Keeper
Kjell-Hugo Grandin
Ulf Friberg
Ulf Brunnberg
Ragnar Vanheden
Björn Gustafson
Dynamit-Harry
Peter Haber
Dr. Max Adrian Busé
Birgitta Andersson
Doris
Elias Ringquist
Lillis
Björn Granath
Lohman
Pontus Gustafsson
Andersson
Bernt Lindqvist
The Chief of Police
Per Grundén
Wall-Enberg
Weiron Holmberg
Biffen Johansson
Lena T. Hansson
Busé's secretary
Rikard Wolff
Count Romanoff
Thomas Segerström
Guard
Jonas Uddenmyr
Guard
Karl Erik Andersen
Jailer
Ulf Eriksson
Patient
Sten Hellström
Patient
Jan Mybrand
Keeper
Kjell-Hugo Grandin
Ulf Friberg
Ulf Brunnberg
Ragnar Vanheden
Björn Gustafson
Dynamit-Harry
Peter Haber
Dr. Max Adrian Busé
Birgitta Andersson
Doris
Elias Ringquist
Lillis
Björn Granath
Lohman
Pontus Gustafsson
Andersson
Bernt Lindqvist
The Chief of Police
Per Grundén
Wall-Enberg
Weiron Holmberg
Biffen Johansson
Lena T. Hansson
Busé's secretary
Rikard Wolff
Count Romanoff
Thomas Segerström
Guard
Jonas Uddenmyr
Guard
Karl Erik Andersen
Jailer
Ulf Eriksson
Patient
Sten Hellström
Patient
Jan Mybrand
Keeper
Kjell-Hugo Grandin
Ulf Friberg