To land a rich husband, golddigger Marjory Stuart goes to Trinidad posing as a debutante. Beach boy Pete promptly unmasks her, but offers to help her catch his enemy, yachtsman Alfred Monroe. Marjory's pal Bubbles turns out to be the old flame of Pete's pal Wally. All the well-planned efforts to land Monroe end in slapstick; then Wally's voodoo priestess landlady gives him a love potion that works...

Cigarette girl Marjory Stuart poses as an heiress in the hope of finding a wealthy husband. When her ship docks at a Caribbean island resort, Marjory drops a fake diamond bracelet overboard, intending to cash in on the ship's insurance. Pete Hamilton, an American ne'er-do-well lounging nearby on his boat with his friend, Wally Case, dives to retrieve the bracelet, however. After having the bracelet appraised, Pete learns that it is made of paste, and tells Marjory that he knows she is a phony. Nightclub performer Bubbles Hennessy, who is aware of Marjory's ruse, has come to the island to find, Wally, her fiancé, whom she is suing for breach of promise. Marjory confesses to Pete her husband-hunting scheme, and Pete decides to help her marry his former schoolmate, Alfred Monroe, a multi-millionaire on vacation at the island. Wally, meanwhile, is shocked when Bubbles slaps him awake from an afternoon nap, but he soon plays on her emotions and cajoles her into paying his rent to his landlady Tessie, a voodoo priestess. Pete and Marjory set up Alfred during a dinner with Marjory in order to interest him in her, but Marjory has to work hard as Alfred has little interest in love. After all of Pete's plans, including a disastrous picnic and home-baked meal and getting Alfred drunk, fail to inspire Alfred to propose, Pete and Marjory decide to try and make him jealous. After they kiss, however, both Marjory and Pete realize they are in love with each other, although neither one admits it. When Marjory cries for help according to their plan, Alfred encounters them and strikes Pete on the chin. Alfred's passion is not stirred, however, until Wally, hiding in the bushes, sprays him with the love potion Tessie used to calm her jealous husband. Alfred then proposes immediately and Marjory accepts. When Mr. Smith, a hotel guest, recognizes Marjory as a cigarette girl while she is rehearsing a number for the hotel's charity fête, Vespers, the hotel manager, becomes suspicious and plans to demand that she immediately pay her bill or be thrown out. Pete overhears Vespers' threats and, in order to save Marjory, has Wally steal a diamond pin he gave to Bubbles. They then raffle off tickets, purportedly to help orphans, offering the pin as a prize, and arrange for Bubbles' ticket to win. Alfred recognizes their trick and believes that they are swindling orphans. Pete reluctantly turns the money over to Alfred, who believes that Pete intended to use the money to start an oyster business. Alfred agrees to lend the money to Pete on the condition that he never again speaks to Marjory. Pete sends the money to Marjory in an envelope, and she receives it just in time to pay her bill. Pete's caring gesture makes Marjory realize that she is sincerely in love with him, and she gently tells Alfred the truth about herself and rejects his proposal. Marjory is sorely dismayed when Pete denies being in love with her and insists that she leave with Alfred the next day, on a ship bound for New York. As the steamship departs, Alfred tosses a gift of $2,000 overboard to Pete, saying that Marjory convinced him it was a sound investment. Pete is now dejected that he has lost Marjory. Wally, believing that Bubbles has left with the ship, goes to his hut, but as he walks through the door, Bubbles sprays him with the love potion and walks the lovesick man over to a priest, who is waiting to marry them. Pete follows Wally into the hut and is delighted to find Marjory waiting for him, armed with the love potion. Pete assures her that she will not need the potion, and kisses her.