Harley Eaton's watermelon patch is raided and vandalized by Cowboy Habersham, Donnie Cole and their rowdy friends. At Brewer's Pond the men engage in a swimming contest with a greased watermelon. After the game is over, the couples pair up and leave the pond. The next day Donnie is missing. Rumor says that Donnie has been romancing Cowboy's wife, Marlene, and that Cowboy is indifferent to the situation. Marlene is a waitress at a cafe owned by Cal Sims, who has offered a generous amount to buy Cowboy's sporting goods store. Sheriff Bill Gillespie and Chief Hampton Forbes cooperate in the investigation.