Singer Tommy Cusack made the mistake of borrowing money from racketeer Roy Faber, whom the SFPD has been trying to put away for nearly a decade. Faber knows Cusack can't afford to pay so he sends his lackey Luther Zahn to extract a favor: Cusack's help with a bank robbery. Ironside correctly guesses the nature of the crime Faber's men plan and prevents it. Now Cusack's in a fix. Faber blackballs him from the city's clubs, then sends men to beat him. But Faber's in a fix, too. Cusack knows enough to put him away, if he'll testify. Trouble is, people who testify against Faber seem to develop health and memory problems...