A dashing ex-officer in His Majesty’s army, Captain Adam Corbett (Calhoun) becomes embroiled in intrigue when he agrees to escort Colonel Wilfred Jackson (Ian Hunter) and his daughter Pauline (Patricia Bredin) on a perilous quest for treasure. Possessing one-quarter of a map, they soon rendezvous with three mysterious characters, each with a fragment and a secret agenda. Armed with only a sword and his wits, Corbett battles brigands, soldiers and thieves as he accompanies the expedition to the island of Monte Cristo, where betrayal and fortune await.