Before he was Zorro or Dracula, George Hamilton was the gentlemanly jewel thief Jeff Hill in Jack of Diamonds. Jeff is mentored in the art of cat burglary by the master thief known as The Ace of Diamonds (Joseph Cotton), who has decided he no longer wishes to tempt fate and is set to retire, but not before passing on his secrets. Jeff uses his dashing good looks to charm beautiful women and relieve them of their “best friend,” with Zsa Zsa Gabor, Carroll Baker and Lilli Palmer – all playing themselves – falling victim to his thievery. Jeff is recruited by rival thief Olga (Marie Laforet) who introduces him to Nicolai (Maurice Evans) who are planning to steal the “World Series” of jewels from an impenetrable vault in Paris. The heist genres parkles in Diamonds, as even the most meticulous planning may not be enough to outwit the police and insurance investigator Von Schenk (Wolfgang Preiss), who is closing in on all of them.