On her wedding day, Polly Courtland runs out of the church leaving Eddy King standing at the altar. Her father, Templeton Courtland, was opposed to the marriage thinking his daughter could do much better than King, a popular and successful jazz musician. In fact, Polly was protecting her sister Midge from George Sherwin, a blackmailer who had photos of the underage Midge checking into a hotel and gambling in Las Vegas with one of Eddy's musicians, Bongo White. Her father was involved in anti-gambling work so the pictures would destroy him. Eddy asks Perry Mason to look into what has happened and why. When Sherwin is killed, Eddy sees Polly leaving his apartment building, so when he enters the apartment and finds the body, Eddy decides to cover for Polly by changing the scene to make it appear that a man was there instead of a woman. Eddy is charged with murder and Perry defends him.
—garykmcd