Betsy Baxter is the plucky stunt-actor star of the 1920s serial adventure, The Flapper Detective. While researching a wing-walking scene, she meets the fearless Winifred Habbamock and discovers a shared background of eerie encounters and eldritch phenomena. For years, Betsy has been investigating the disappearance of an old friend during the horror-struck filming of The Mask of Silver, when she learns of his reappearance in Arkham, she and Winifred hit the road to investigate. But Arkham is full of mysteries and danger. Betsy will need all her skills, and new allies, to prevent an otherworldly cataclysm from consuming her and all of Arkham.