Achtung! Cthulhu: Keeper’s Guide to the Secret War is a new RPG Core Book from Modiphius Games. Having reviewed the Investigator’s Guide, it is only natural to take on the next book in the series – the Keeper’s Guide. For me, as a keeper or game master, this is where the meat of the story begins. This is where the setting really comes out for me. Included in this book, among other things, are Allied and Nazi forces & intelligence agencies, Occult organizations and Mythos-based missions, new tomes, secret weapons, artifacts & equipment, key characters & vile creatures, and new rules and strategies for World War II combat & survival. Like the Investigator’s Guide review, I thought it best to go chapter by chapter and comment on each.