Hammer's search for a jewel thief leads to an upscale beauty salon, where henchmen rob the society matrons’ homes during their hair appointments. Hammer goes undercover as a hairdresser in order to stop the British thieves who are after the ladies' jewels.

Hammer goes on trial for the murder of the city's leading crime boss. Capt. Trunk and Dori are called upon to give damaging testimony against Hammer and everyone is convinced he’s guilty, including Hammer himself.