Ellen Robb does more than just sing for her supper - she also dances and sells cigarettes in a two-bit gambling parlor in a one-horse town. But when she hits a sour note with her scheming employer by refusing to help fleece a fat-cat customer in a crooked card game, she finds herself out of all three jobs. That's when she sings her song of woe to Perry Mason, who promises to turn her blues into greenbacks with the help of his crack team, Della Street, and Paul Drake, and a hefty lawsuit.
Things are humming along just fine - until murder interrupts the merry melody of Mason's crafty legal maneuvers. When the vindictive wife of Ellen Robb's not-so-secret lover turns up shot to death, Mason is certain it's a frame-up - and that his songbird client's belligerent boss is to blame. Until his own gun is found at the scene. The cocksure Mason will have to change his tune - and do some quick thinking - or else this case could be his swan song.