The only thing standing in the way of a young pianist making her big debut is the conductor's wife, who's convinced the two are having an affair. When the old lady suddenly dies, there's nothing standing in her way--except an autopsy that reveals death by poisoning.
The singer at a New York state casino comes to Queen when her boyfriend, the piano player, is found dead with a counterfeit bill clutched in his hand. Convinced it wasn't suicide, Ellery investigates by going undercover as the new pianist.
After having been made a fool of in court by Ellery Queen, a lawyer checks into a sanitarium for six months. Upon his release, he's determined to get his revenge upon the amateur detective.