Directed by Umberto Lenzi. A tough, rule-bending cop pursues a maniacal, trigger-happy hunchback, a one-handed bank robber and their cronies in an effort to bring Rome's most powerful crime lord to justice.
When a US intelligence agent (Anthony Quinn) is unable to bring a ruthless drug baron (James Mason) to justice, he resorts to hiring a contract killer. But the man he is put in contact with (Michael Caine) turns out to be an old friend.