| Issue | #4 |
| Published | March 1937 |
| Cover Price | 0.10 |
| Pages | 68 |
| Editing | William Cook ? |
| Notes | Data taken from Howard Keltners Golden age index & the existing GCD index |
| Genre | adventure |
| Script | Rodney Thompson |
| Pencils | Rodney Thompson |
| Inks | Rodney Thompson |
| Notes | Data taken from Howard Keltners Golden age index & the existing GCD index. |
| Reprinted | in Fantastic Adventures (A.C.E. Comics, 1987 series) #2 |
| Script | Ellis Edwards |
| Pencils | Ellis Edwards |
| Inks | Ellis Edwards |
| Reprinted | in Keen Detective Funnies (Centaur, 1938 series) #v1#9 |
| Characters | 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. |
| Genre | crime |
| Script | Will Eisner [as William Eisner] (signed) |
| Pencils | Will Eisner [as Eisner] (signed) |
| Inks | Will Eisner [as Eisner] (signed) |
| Reprinted | in Keen Detective Funnies (Centaur, 1938 series) #v2#6; in Art of Will Eisner, The (Kitchen Sink Press, Inc., 1982 series) #1; in Men of Mystery (AC, 1999 series) #81 (2010) |
| Script | Joseph Buresch |
| Pencils | Joseph Buresch |
| Inks | Joseph Buresch |
| Reprinted | in Keen Detective Funnies (Centuar, 1938 series) #v2#10? |
| Script | Joe Campbell |
| Pencils | Joe Campbell |
| Inks | Joe Campbell |
| Reprinted | in Keen Detective Funnies (Centaur, 1938 series) #v2#10? |
| Script | John Ewing |
| Pencils | John Wilson |
| Inks | John Wilson |
| Script | Vic Dowling |
| Pencils | Vic Dowling |
| Inks | Vic Dowling |
| Reprinted | in Keen Detective Funnies (Centaur, 1938 series) #10? |
| Notes | Data taken from Howard Keltners Golden age index & the existing GCD index |
| Reprinted | in Keen Detective Funnies (Centaur, 1938 series) #10? |