Steve Harper's upcoming wedding to Cynthia Merrick on the Caribbean island of San Marcos is threatened by his tenacious former girlfriend, Mickey Fitzgerald, and by Cynthia's disapproving aunt. Steve's pal, Jim "Lucky" Moore, an insurance agent, conceives an innovative "love insurance" policy that will pay Steve $1 million if his wedding to Cynthia doesn't happen. The policy is underwritten by a tough nightclub impresario, Roscoe, who warns Jim to ensure that the wedding goes off as planned. Roscoe also dispatches his henchmen, Abbott and Costello, to keep Mickey from interfering.
But Mickey dupes Abbott and Costello into taking her to San Marcos, while Cynthia grows attracted to Jim. After Mickey shows Cynthia the insurance policy, Cynthia calls off the wedding. Roscoe arrives to force the marriage at gunpoint, but Jim foils his plan and apologizes to Cynthia. Steve and Mickey, meanwhile, acknowledge their attraction and force their own wedding at gunpoint. This voids the policy and Roscoe avoids the $1 million payout.
