The enigmatic Carl Sanford is the master of all things occult in Arkham, until a charismatic newcomer threatens to take everything away from him in this dark mystery set in the world of Arkham Horror.

Chaos is coming to Arkham, and its herald is Randall Tillinghast. The dapper older gentleman has recently arrived in the city and his establishment of a new occult bookshop draws the ire of Carl Sanford, the head of Arkham's secret, esoteric order, the Silver Twilight Lodge.

Sanford expects to crush the newcomer like an ant and take what he wants from the wreckage . . . but Randall Tillinghast isn't quite as humble and harmless as he seems. In possession of an array of magical artifacts, Tillinghast begins to consolidate his dreams of power before turning his sights on the Lodge.