Jack Singer, a commitment-phobic private investigator, promises his dying mother that he will never marry. However, under pressure from his girlfriend Betsy, he finally overcomes his fears and agrees to tie the knot. They fly to Las Vegas for a quick wedding, but their plans take an unexpected turn when Jack loses all their savings in a poker game to a smooth-talking professional gambler, Tommy Korman. To settle the debt, Tommy proposes that Jack lend him Betsy for a weekend, as she bears a striking resemblance to his late wife.

Reluctantly, Jack agrees, setting off a wild chain of events as he realizes the true extent of Tommy's manipulative nature. Desperate to get Betsy back, Jack finds himself embroiled in a series of misadventures involving Elvis impersonators, parachute jumps, and cross-country chases. Meanwhile, Betsy, caught in Tommy's web of charm, begins to see through his schemes but faces her own set of dilemmas. Jack's relentless efforts to rescue her escalate, leading to a high-stakes showdown that tests the limits of love and loyalty.