

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.
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Cast

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
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