Developed by Call of Cthulhu mastermind Mark Morrison as a secret chapter in the story of Horror on the Orient Express, Reign of Terror has been designed for play with or without reference to that campaign. If used with Horror on the Orient Express, it provides an exciting and action-packed “living handout” that brings new insights and illuminates the players into the full horror of one of the campaign’s dire villains. Part One, set in 1789 amid the stirrings of the revolution, sees the investigators descend into the catacombs of Paris and brave the tribulations of courtly life, where debauchery and wickedness bring their own terrors. Part Two, set during The Terror, catapults the investigators into a conspiracy, where spies and agents seek out those who would destabilize the new regime. Caught amongst the chaos and dangers of Paris, the way must be found to stop a nightmare that would plunge France and the rest of Europe into darkness. This book provides a stand-alone setting, with a plethora of historical details to help the Keeper bring Paris and the French Revolution to life. Profusely illustrated throughout, with detailed maps of Paris, the Palace of Versailles, and more! Alongside the two-part scenario of Reign of Terror is a range of scenario seeds, each providing roots for extending play and building a longer, more in-depth campaign.