Sisters Kay and Barbara Latimer are working as car hops in a Texas drive-in restaurant with their aunt Susan, who is the cook, when they are notified that an expected inheritance of $55,000 is only $4,000 after taxes and fees.  Determined to marry a millionaire, Kay talks Barbara and Susan into spending the money on a trip to Miami, where she hopes to hook a rich man at a resort.

With Barbara posing as Kay's secretary and Susan as her maid, the three women check into the Flamingo Hotel and make the acquaintance of Jack O'Hara, a bartender who pontificates about his hatred of fortune hunters.  Jack, who quickly becomes enamored of Susan, believes that Kay is on the level and promises to steer her away from gold diggers.

Kay finagles an invitation to a party being hosted by rich Jeffrey Bolton and, while there, also meets Phil McNeil, heir to the renowned McNeil Mines.  Boyhood friends Jeff and Phil begin a fierce rivalry for Kay, who cannot make up her mind between the two handsome men, nor does she notice that Barbara has fallen in love with Jeff.

After three weeks, the women are in trouble because they need $150 to pay their hotel bill, but Susan borrows the money from Jack, who has proposed to her.  Realizing that she needs to get one of the men to propose to her that evening, Kay brings Barbara along to a dance to keep one of them occupied.  Kay gets Barbara to dance with Jeff while she talks with Phil, with whom she has fallen in love.  Phil admits to her that he is broke, and that the McNeil Mines will not be profitable again for at least five years.  Kay confesses that she, too, came to Miami to find a rich spouse, and the pair reluctantly agree to pursue other partners.  Phil tells Jeff that Kay loves him, after which she accepts Jeff's proposal.

As the women are packing to leave for Jeff's father's island, however, Jack overhears them talking about their scheme and threatens to tell Jeff.  After locking Jack in the bathroom, the women leave for the island, where they meet William, Jeff's businessman father.  Desperate to see Kay again, Phil goes to the island and volunteers to be Jeff's best man.  The woman are also stunned by the arrival of Jack, who threatens to tell all if he determines that Kay does not really love Jeff.

On the night of a party that Jeff is throwing for Kay, Barbara encourages Jeff to accept a challenging job in South America to escape from under his father's shadow, while Phil admits to Kay that he loves her.  As Phil is trying to persuade Kay that they belong together no matter what, Jeff enters the room.  Phil and Kay explain that they are going to get married, and Jeff acknowledges that he has loved Barbara all along and will marry her.  Soon all ends well, as Susan and Jack also come to a romantic conclusion, and the three couples begin their lives together.