Publications (2) 
| Title | Code | Date | Publisher | System (Setting) |
|---|---|---|---|---|
 Investigator's Guide to the Secret War | MPS01031CS | 2013 | Modiphius Entertainment | Call of Cthulhu (Achtung!), Savage Worlds (Achtung!) |
 Investigator's Guide to the Secret War * | MUH51740 | 2019 | Modiphius Entertainment | Call of Cthulhu (Achtung!) |