On sale date from the publication date found at the Catalog of Copyright Entries, Part 2, Periodicals, New Series, Volume 34, 1939, Number 2. Second class permit. Copyright number 416822.
Hammer Donovan; Captain Spencer; Fen Soo (Donovan's servant); Mike Morelli (villain); Tony (villain, death); Curley [aka as Curly] (villain, death); Hophead Harry (villain)
Synopsis
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.