Strange disappearances haunt the city of Arkham, Massachusetts. With each object, building, or person that vanishes, they are erased not just from physical existence, but from history and memory as well. Only you remember - or so you believe. Soon, your investigation unravels into an international conspiracy, and you are recruited by a shadowy government agency whose sole purpose is the collection and research of paradimensional implements they call "Keys." However, you are not the only ones seeking them out...
In The Scarlet Keys Campaign Expansion for Arkham Horror: The Card Game, one to four investigators are sent on a dangerous assignment consisting of up to ten scenarios spread across the globe. Race against time to discover eldritch Keys before they are found by members of the mysterious and deadly Red Coterie...or work together with your foes to stop the greater threat that lurks in the shadows. But can you really trust them?