Quick Answer
If you're a player, start with the Investigator Handbook; if you're the one running the game, the Keeper Rulebook is essential. Most groups eventually need both, but the Keeper Rulebook is the core rulebook.
Different Roles, Different Books
The Investigator Handbook is designed for players who create and roleplay investigators. It includes over 100 occupations, skill descriptions, and guidance on getting the most from the game. It also covers organizations, the classic 1920s setting, and equipment for both eras.
The Keeper Rulebook is the essential rulebook for the Keeper—the game master. It contains the full rules for running the game, including sanity mechanics, combat, and the Cthulhu Mythos. It's the book you need to actually play the game.
Content Overlap and What You Might Miss
While the Investigator Handbook focuses on character creation and player resources, the Keeper Rulebook provides the core game rules. If you only buy the Investigator Handbook, you'll miss essential rules for running the game. If you only buy the Keeper Rulebook, you'll have the rules but less player-facing detail on occupations and organizations.
For a complete experience, many groups buy both: the Keeper uses the Rulebook, and players reference the Investigator Handbook.
Which Book Should You Buy?
- You are a player: Start with the Investigator Handbook. It gives you everything you need to create and play a character, including occupations, skills, and setting details.
- You are the Keeper (game master): The Keeper Rulebook is essential. It contains the full rules for running the game, including combat, sanity, and the Cthulhu Mythos. If you're new to running Call of Cthulhu, the Keeper Rulebook is your primary reference.
- You want a complete set: Buy both. The Investigator Handbook enriches player experience, while the Keeper Rulebook provides the core rules. Together they cover all aspects of the game. Consider starting with the Keeper Rulebook if you're the one organizing the game, then add the Investigator Handbook later.
Product Facts
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Call Of Cthulhu 7th Edition Investigator Handbook: The Investigator Handbook contains expanded rules for creating player characters, including over 100 occupations and skill descriptions, plus guidance on organizations, the 1920s setting, and equipment for both eras. This is the player's essential resource, offering depth for character creation and roleplaying.
Call Of Cthulhu 7th Edition Investigator Handbook
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Call Of Cthulhu 7th Edition Keeper Rulebook: The Keeper Rulebook is the core rulebook for Call of Cthulhu, covering the rules for secrets, mysteries, and horror, and for running the game as the Keeper. This is the must-have book for anyone running the game, as it contains the full rules and guidance for the Keeper.
Call Of Cthulhu 7th Edition Keeper Rulebook
Who Should Buy Which?
Best for
- Players who want detailed character creation options and roleplaying guidance
- Keepers who need the full rules to run the game effectively
Not for
- Players who only need the basic rules and don't want extra character options
- Keepers who prefer a lighter ruleset and don't need extensive background detail