A new type of safe, touted as impregnable, alarms insurance companies. To deny the factory's assumptions, three burglars are hired with the task of violating one. A wealthy jeweler's new safe is targeted.
| Actor | Role |
|---|---|
 Catherine SpaakValentine | Valentine |
 Philippe LeroyGeorge | George |
 Gastone MoschinCommissario Simon | Commissario Simon |
 José CalvoMartin | Martin |
 Antonio CasagrandeTotonno | Totonno |
 Juanjo MenéndezNot listed | Not listed |
 Cesare GelliJohn | John |
 Maria Cumani QuasimodoOlga | Olga |
 Gianni BonaguraNotaio Jacques Gaspard | Notaio Jacques Gaspard |
| MMarianne LeiblNot listed | Not listed |
| LLore EwoyNot listed | Not listed |
| MMiguel de la RivaNot listed | Not listed |
| LLuis MoranNot listed | Not listed |
| VVincenzo FalangaNot listed | Not listed |
 Sandro DoriNot listed | Not listed |
 Raffaele Di MarioNot listed | Not listed |
 Valentino MacchiNot listed | Not listed |
| LLoren EwingNot listed | Not listed |