Unfortunately, people go missing all the time. It's a sad reality of life. But when people go missing around Arkham, there's an extra layer of mystery associated with it. What sort of otherworldly horror is at work this time? That's what players will have to figure out in
Mansions of Madness Volume 1 – Behind Closed Doors features the beloved adventures Mister Corbitt and The Crack’d and Crook’d Manse (both long out of print) alongside three brand new haunts of horror. You can score the 224 page PDF at DriveThruRPG for $19.99 with a print edition on the horizon. Mansions of Madness is a cooperative board game of mystery and investigation inspired by the writings of H.P. During each game, one to five players explore a location to unravel a mystery. This companion app guides you through the haunted halls and misty alleyways of Arkham in stories of varied length and difficulty. Mansions of Madness Volume I: Behind Closed Doors is the first part of Chaosium's expansive revision of the well-regarded Mansions of Madness scenario collection. As the 'Volume I' bit implies, it looks like this will end up being a multi-volume series, and presumably each volume will follow the same format of this one in terms of. Mansions of Madness Vol. 1 contains five scenarios for use with the Call of Cthulhu Starter Set or the 7th Edition Call of Cthulhu: Keeper Rulebook. It includes two fully updated and revised classics, along with three brand new adventures, and all can be played as standalone adventures, used as sidetracks for ongoing campaigns, or strung.
Dark Reflections, a new DLC scenario for
From the announcement:

Mansions Of Madness - Dark Reflections Cracks
Mansions of Madness Second Edition is a cooperative, app-assisted horror game that leads one to five players through the twisted world of H.P Lovecraft's Cthulhu mythos. Dark Reflections expands the Arkham universe and offers players hours of new gameplay with a new adventure as investigators must solve the mystery of a young woman’s sudden disappearance. The mystery's level three difficulty invites both new and experienced players to leave behind the world they know to save an innocent soul, even if it costs them their lives or their sanity.
Three months ago, Ada Miller inherited the estate of her great-aunt, including a house in the country. With this new windfall, she decided to quit her job as the Arkham Advertiser’s society columnist to write her first novel. According to her publisher, Ada soon began to experience strange happenings in this secluded setting and insisted that there was something wrong with the house. Now, the young writer has disappeared. Fearing the worst, the publisher has contacted Arkham's finest investigators to discover the fate of the unfortunate Ms. Miller.