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.
| Release Date | October 30, 1992 | |
|---|---|---|
| Status | Released | |
| Original Title | Jönssonligan & den svarta diamanten | |
| Runtime | 1h 44min | |
| Budget | — | |
| Revenue | — | |
| Language | Swedish | |
| Original Language | Swedish | |
| Production Countries | Sweden | |
| Production Companies | SandrewsNordisk Tonefilm | |
