Matt Helm is called out of retirement to stop the evil Big O organization who plan to explode an atomic bomb over Alamagordo, NM, and start WW III.

Willie Duggans, a tenderfoot from the east, arrives in the wild west and soon experiences its violence. Willie discovers the easy money in bounty killing and must choose between that violent lifestyle and the love of a beautiful saloon singer.

A psychiatrist treats a woman of three faces: neurotic Elizabeth, wanton Lizzie, and charming Beth.