Hammer Donovan; Captain Spencer; Fen Soo (Donovan's servant); Mike Morelli (villain); Tony (villain, death); Curley [aka as Curly] (villain, death); Hophead Harry (villain)
Hammer Donovan is called back onto the Police force, with no legal limitations, to track down a notorious killer and his gang that have been bumping off cops, and whose identity and whereabouts are being protected by the underworld.
Tom Collins (football player); Spike (gangster); Rose (gun moll)
Football player Tom Collins is kidnapped by Spike and Rose to affect the outcome of a match, but Tom feigns illness. When Spike and Rose try to drive him to a hospital Tom crashes their car, informs on them to a nearby policeman, then gets to the match in time to win the game.
Banning (gangster); Tom (heir); Mr. Clark (Tom's boss); Captain Bangs (policeman); Mary (wealthy woman); Dan Darling (dying man)
Cousins Banning and Tom head to the bedside of their dying uncle Dan. Banning tries to murder Tom so he can claim the full fortune but Tom survives the attempt, informs the police and arrives in time to keep his uncle from changing the will.