A master thief known as the Ace of Diamonds decides it's time to retire before he gets caught, so he teaches everything he knows to Jeff Hill, his protégé.

On a luxury liner, Jeff, now nicknamed the "Jack of Diamonds", discovers he has a competitor aboard, another burglar pulling the same kinds of thefts.

[1][3] Producer Sandy Howard described George Hamilton before filming as "a fine actor, I'm convinced, and he's a hot commodity these days", due in part to the fact he was dating the President's daughter.

[5] (Hamilton's draft deferment was highly controversial at the time because it was thought that his relationship with the president's daughter gave him preferential treatment.

In his review for the New York Times, Bosley Crowther wrote, "Unless you have a particularly urgent reason for wanting to watch George Hamilton modeling a dazzling assortment of the most beautifully cut men's clothes...you may safely skip Jack of Diamonds, which turned up in neighborhood theaters yesterday.