The Crooked Web (1955)

Following World War II, ex-G.I. Stan Fabian opens a drive-in restaurant, where his girlfriend, Joanie, is a car hop. They want to get married someday, but less-than-stellar business puts a hold on that. One day, Joanie's ne’er-do-well brother Frank blows into town with a money-making scheme. She's against it, but inveterate gambler Stan finds the promise of riches too seductive to resist.