Johnny Slade, a down-and-out lounge singer, is hired by an unknown individual to start a trendy new club, with the caveat that each night he will perform a new—and terrible—song. Noticing that each time he sings one, a fresh crime is committed, Johnny gradually concludes that his songwriter-benefactor is a powerful mob boss hidden in plain sight, and that his "Greatest Hits" are the only way for the man to command his gang...