April May is convinced she has the worst job at the Arkham Advertiser: placing adverts for lost dogs is about as tedious as it gets! The only thing that alleviates her boredom is her fantasies of pulp adventures. But when her best friend succumbs to a mysterious unwakeable sleep, she realizes the city is sleepwalking towards something terrible. It’s been raining for days and the Miskatonic River is rising to dangerous levels. Arkham grinds to a halt as its population falls into a deep sleep. Under cover of these apparently unrelated disasters, shadowy forces move to usher in something truly nightmarish. With the aid of psychologist Carolyn Fern and Professor Harvey Walters, April May must venture into the strange realms of the Dreamlands, where a man in a golden mask holds the key to rousing the city from its collective nightmare. But for Arkham, the waters continue to rise, and it’s closer than ever to the manifestation of something that no one can wake from.