Adele Tasca (Sophia Loren) is ervan overtuigd dat haar man, een chemicus, vermoord werd door de rijke zakenman en drugsbaron Stegner. Wanneer zij naar justitie stapt om haar vermoeden te melden, besluit justitie om gangster Sal Hyman onder druk te zetten om Stegner op te sporen. Hyman schakelt op zijn beurt oud-wapenmaker Jerry Fanon (James Coburn) en diens assistent Catlett (O.J. Simpson) in om Stegner voor eens en voor altijd ten val te brengen.
Nee, helaas is Firepower nog niet beschikbaar op Netflix in Nederland.
| Directing | Michael Winner | Director |
| Writing | Bill Kerby | Story |
| Writing | Michael Winner | Story |
| Writing | Gerald Wilson | Screenplay |
| Crew | Terry Leonard | Stunt Double |
| Crew | Terry Leonard | Stunt Coordinator |
| Art | John Stoll | Production Design |
| Sound | Gato Barbieri | Original Music Composer |
| Art | Robert Coleman | Set Decoration |
| Production | Cis Corman | Casting |
| Costume & Make-Up | Richard Mills | Makeup Artist |
| Editing | Michael Winner | Editor |
| Art | Robert Gundlach | Art Direction |
| Costume & Make-Up | Allen Weisinger | Makeup Artist |
| Art | Simon Wakefield | Set Decoration |
| Costume & Make-Up | Joseph G. Aulisi | Costume Design |
| Production | Michael Winner | Producer |
| Art | John Blezard | Production Design |
| Costume & Make-Up | Lee Trent | Hairdresser |
| Costume & Make-Up | Stephanie Kaye | Hairdresser |
| Camera | Robert Paynter | Director of Photography |
| Crew | Glenn Randall Jr. | Stunts |
| Production | David Middlemas | Production Supervisor |
| Directing | Belle Halpern | Script Supervisor |
| Directing | Kay Fenton | Script Supervisor |
| Production | Beryl Harvey | Production Coordinator |
| Production | Barbara Duncan | Production Coordinator |
