In New York City, Jack Singer, a detective who handles divorce cases, has been dating schoolteacher Betsy Nolan for a long time, and she is ready for marriage. However, Jack’s mother elicited a deathbed vow that he will never marry, and he is haunted by his promise. Betsy finally tires of Jack’s reluctance and threatens to leave him. Fearful of losing her, Jack suggests a spontaneous trip to get married in Las Vegas, Nevada, and they arrive during a convention of Elvis Presley impersonators. Tommy Korman, a high-stakes gambler and mobster, sees Betsy in the lobby and is struck by her resemblance to his late wife, Donna. Tommy, an eternal and ruthless romantic, determines to romance Betsy and marry her. Jack is very nervous about getting married and decides to relax by gambling first. Tommy lures him into a high-stakes poker game, and Jack soon finds himself $65,000 in debt to the mobster. Tommy offers to accept a platonic weekend with Betsy as payment for the debt, and Jack reluctantly agrees. Betsy is furious, but Tommy charms her and she agrees to the arrangement. Tommy Korman meets Betsy for drinks and reveals they will be spending the weekend at his beachfront estate in Kauai, Hawaii. As Betsy packs for the trip, Jack realizes the magnitude of his mistake, and asks her to marry him immediately. However, Betsy does not believe his proposal is sincere, or he would have married her upon their arrival in Vegas. She plans to honor the deal with Tommy, and informs Jack that they will return from Hawaii mid-week. Tommy flies Betsy to his estate, where she meets his family and is impressed by his thoughtfulness. Upset, Jack returns home to New York to wait. He becomes more agitated when he sees a television news story about a volcano erupting in Hawaii, and spots Betsy and Tommy among the excited onlookers. Jack flies to Hawaii, but his efforts to see Betsy are thwarted by Tommy’s men. As Jack frantically tries to reach her, Tommy pressures Betsy to marry him. He lies to her about the deal, claiming that Jack only owed $3,000 and that it was Jack who offered a weekend with her as payment. Betsy is upset, and tries to telephone Jack. She learns he left Las Vegas, but she is unable to reach him at home. Believing Tommy’s lies, Betsy accepts his proposal. He insists they return to Las Vegas and get married immediately. When Jack learns of their departure, he tries to get a flight back to Las Vegas, but Tommy uses his airline connections to intervene. Jack gets a flight to Utah, and as he searches the airport for a way to reach Las Vegas, he meets the Utah chapter of “The Flying Elvises,” a group of skydiving Elvis impersonators. Jack suits up as “Elvis Presley” and prepares to join the group’s skydive into downtown Las Vegas during the Elvis Impersonation convention. Meanwhile, Tommy tries to rush Betsy to a wedding chapel. When she hesitates and asks to wait a few weeks, Tommy offers her $1 million to marry him right away. She is disgusted by the offer and starts to leave. However, Tommy threatens that she agreed to the marriage, and no one breaks their word to him. Intimidated, she asks to use the ladies room before leaving for the wedding chapel. As Tommy waits, Betsy follows several showgirls to their dressing area, dons a showgirl’s costume, and sneaks out of the hotel. As Tommy and his men search for Betsy, she hides among the crowds lining the street to see the arrival of The Flying Elvises. Although Jack is afraid of dying, his love for Betsy overcomes his fear, and he jumps out of the plane with the other skydivers. Betsy hears Jack’s name announced as he lands, and she runs into his arms. He declares his love, and asks her to marry him. Tommy sees the couple together and realizes he has lost Betsy. As Tommy heads off to another poker game, Jack and Betsy marry in a Las Vegas wedding chapel with The Flying Elvises in attendance.