The Secret 6
Titles (5)
| # | Title | Author(s) | Year | Type |
|---|---|---|---|---|
| 1 | The Red Shadow | Robert J. Hogan | 1934 | |
| 2 | House of Walking Corpses | Robert J. Hogan | 1934 | |
| 3 | The Monster Murders | Robert J. Hogan | 1934 | |
| 4 | The Golden Alligator | Robert J. Hogan | 1935 | |
| The Secret 6: The Complete Adventures | Robert J. Hogan | 2009 | Omnibus |