From the back cover:
For the Good of Mankind
Whether in the pursuit of knowledge or of vengeance, man has ever striven to seek greater understanding of the world around him. Sometimes the seeker learns of things dark and forbidden, things never meant to be discovered.
The seeker of knowledge finds that the world is infinitely vaster and more sinister than imagined, and is driven to ultimate despair and insanity. Already of warped mind, the seeker of vengeance inevitably turns his discoveries to corrupt ends.
Fatal Experiments is a collection of three independent 1920s adventures for the Call of Cthulhu roleplaying game. Two of the three scenarios are suitable for both beginning and experienced players, making this book a perfect companion for first-time buyers of the Call of Cthulhu game system. The remaining adventure is unusually dangerous - to be played only by experienced, foolhardy investigators.
The article New & Old Weapons for Call of Cthulhu discusses black-powder weaponry, and details many unusual and custom guns that have been created by enterprising gunsmiths, or that might be commissioned by investigators. Two 2-page fold-outs illustrating many of these antique or unusual firearms are provided.