At a desolate relay station in the west, a stagecoach attendant and a stranded woman traveller are held captive by a band of escaped convicts.

The new commander of a Navy Underwater Demolition Team--nicknamed "Frogmen"--must earn the respect of the men in his unit, who are still grieving over the death of their former commander and resentful of the new one.

Sophia Loren stars as Phaedra, a poor sponge diver on the lovely Greek isle of Hydra. While diving, she discovers an ancient brass and gold stature of a boy riding a dolphin, which is said to have the magical power to grant wishes. Her shiftless boyfriend wants to sell it to an unscrupulous art collector (Clifton Webb), but Phaedra wants to give it to anthropologist Jim Calder (Alan Ladd), who would return it to the Greek government.

After two gang-related killings in "Center City," a suspect (who was framed) is arrested, released on bail...and murdered. Inspector Briggs of the FBI recruits a young agent, Gene Cordell, to go undercover in the shadowy Skid Row area (alias George Manly) as a potential victim of the same racket. Soon, Gene meets Alec Stiles, neurotic mastermind who's "building an organization along scientific lines." Stiles recruits Cordell, whose job becomes a lot more dangerous.

Wealthy American, Jervis Pendleton has a chance encounter at a French orphanage with a cheerful 18-year-old resident, and anonymously pays for her education at a New England college. She writes letters to her mysterious benefactor regularly, but he never writes back. Several years later, he visits her at school, while still concealing his identity, and—despite their large age difference—they soon fall in love.