| 0 | - | cover | 1 | pencils: Lou Fine; inks: Lou Fine | Green Mask [Michael Shelby] |
| 1 | - | foreword, introduction, preface, afterword | 1 | script: Victor Fox | |
| 2 | A Modern Robin Hood | comic story | 9 | pencils: Walter Frehm; inks: Walter Frehm | The Green Mask [Michael Shelby] (introduction); "News" Blake; Rocky Vilon (villain, introduction, death); Cyrus Boomer (villain, introduction) |
| 3 | Origin of Rex Dexter of Mars | comic story | 6 | script: Dick Briefer; pencils: Dick Briefer; inks: Dick Briefer | Rex Dexter (introduction, origin); Montague Dexter (introduction); Pres. Grover (introduction); Cynde (introduction); Boris Thorax (villain, introduction); Vesoff |
| 4 | How To Become a Detective | comic story | 2 | script: Norman Lee (credited); pencils: Norman Lee (signed); inks: Norman Lee (signed) | Billy Bounce (introduction); Midget Moe |
| 5 | The Coming of Chen Chang | comic story | 6 | pencils: Munson Paddock; inks: Munson Paddock | Chen Chang (villain, introduction); Wong (villain, introduction); Richard Kendall (introduction); Decker; Mr. Denby |
| 6 | Skulduggery on Smoky Mountain | comic story | 3 | pencils: George Tuska; inks: George Tuska | Wing Turner (introduction); The Chief (villain, introduction); Clutch (villain, introduction) |
| 7 | Real Life Personal Interviews with Famous Detectives | character profile | 1 | pencils: Lee Harris; inks: Lee Harris | Detective Barney Ruditsky |
| 8 | Trapped by the Top | comic story | 4 | pencils: George Tuska; inks: George Tuska | Zanzibar (introduction, a magician); The Top (villain, introduction) |
| 9 | The Case of Tintype's Will | comic story | 4 | script: Fred Schwab; pencils: Fred Schwab; inks: Fred Schwab | Hemlock Shomes (introduction); Dr. Potsam (introduction); Elmer T. Tintype (introduction); Sloppy Joe (introduction) |
| 10 | The Haunted House | text story | 2 | script: Will Eisner | Mickey; Jerry; Pete; Joe Donner; Sgt. Matterson |
| 11 | Trouble at Gun Hollow | comic story | 4 | pencils: Arthur Peddy; inks: Arthur Peddy | The Waco Kid (introduction); Brazos Teale (villain, introduction); Craig Bridger (introduction); Flash (horse, introduction) |
| 12 | Another Bombing Outrage | comic story | 4 | pencils: Art Franklin; inks: Art Franklin | Inspector Bancroft (introduction); Inspector Grainger (introduction); Stuart Bledsoe (villain, introduction) |
| 13 | The Coming of the Blue Beetle | comic story | 4 | script: Will Eisner; pencils: Charles Nicholas; inks: Charles Nicholas | The Blue Beetle [Dan Garret] (introduction); Mike Mannigan (introduction); The White Face Gang [John Brandes, others] (villains, introduction); Mr. Vander; Donnell; Abe |
| 14 | The Panama Canal Affair | comic story | 6 | script: Will Eisner; pencils: Bob Powell; inks: Bob Powell | D-13 [Richard Anthony] (introduction, a secret agent); Manata (villain, introduction); Sancho |
| 15 | The Valley of the Dead | comic story | 3 | pencils: John Lindermayer; inks: John Lindermayer | Capt. Danny Scott of the Bengal Lancers (introduction) |
| 16 | Saboteurs on the S. S. Regina | comic story | 6 | pencils: Klaus Nordling; inks: Klaus Nordling | Lt. Drake of Naval Intelligence (introduction); Lobardi (villain, introduction); Kutch (villain, introduction); a girl (villain, introduction) |
| 17 | Wonderworld Comics | promo (ad from the publisher) | 1 | letters: typeset | |