From the publisher's website:

Up ahead, isolated in the Massachusetts countryside, stands a secluded mansion. This is where the clues have led you. This is where you will finally find the answers you have been seeking. As you advance through the cold, driving rain, the dim light dancing in the ornate windows gives the appearance of a dozen sinister eyes watching your approach. The very walls are infested with evil and the great house seems to stare at you with hostility, but despite the growing fear gnawing at your soul, you press on. You must. This madness has to end, and by God, it will end tonight… even if it kills you. Designed by Corey Konieczka, Mansions of Madness is a scenario-driven board game of occult horror and mystery for two to five players. One player takes on the role of the keeper, a malevolent force working to complete a sinister plot. All other players take on the roles of investigators who explore an eerie location in the hopes of solving a mystery before it’s too late. The keeper’s goal is to fulfill an evil scheme, using the weapons of fear, paranoia, and terrifying monsters. The investigators win or lose as a team, and must keep their wits about them to find the artifacts, weapons, and clues needed to stop the keeper’s diabolical plot. Can a handful of brave investigators uncover the truth in time or will the wicked plans of the keeper come to fruition?