Down-and-out lounge singer Johnny Slade is hired by a mystery man to open a hot new club, the catch being he’s given a new–and terrible–song to sing each night. Noticing that whenever he sings one a new crime is committed, Johnny gradually realizes his songwriter-benefactor is a powerful mob boss in hiding and his “Greatest Hits” are the only way the man can give orders to his crew…

Herman owes a lot of gambling debts. To pay them off, he promises the mob he’ll fix a horse, so that it does not run. He intends to trick his animal-loving cousin, Virgil, an apprentice veterinarian, into helping him. Of course, he doesn’t tell Virgil what he is really up to. Mistaken identities are assumed, while along the way, Virgil meets a female vet and Herman falls for the owner of the horse. Goons and mobsters are also lurking around; so beware!