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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.
Featured Crew
| Hans Åke Gabrielsson | Director |
| Rolf Börjlind | Writer |
| Hans Åke Gabrielsson | Writer |
| Katinka Faragó | Producer |
| Ingemar Ejve | Producer |
| Rolf Lindström | Director of Photography |
| Thomas Lindahl | Original Music Composer |
| Roger Sellberg | Editor |
| Carolina Häggström | Continuity |
| Kjell Jansson | Sound Editor |