After the American Civil War, mercenaries travel to Mexico to fight in their revolution for money. The former soldier and gentleman Benjamin Trane meets the gunman and killer Joe Erin and his men, and together they are hired by the Emperor Maximillian and the Marquis Henri de Labordere to escort the Countess Marie Duvarre to the harbor of Vera Cruz.

Everything you need to know is telegraphed by the title of this Spanish-language drama. The story takes place in a hothouse Mediterranean setting and combines lust, intrigue and murder in the overheated sexploitation style that was popular during the late 1950s and early '60s.