All the guests are being murdered - horribly! - at this extravagant masquerade party set all across the sprawling and bizarre Sexy Brutale casino mansion.
Then at midnight, the clock re-winds and the grisly pantomime all plays out again in exactly the same way.

You awake on the floor of one of the rooms wearing a mask with a bloody handprint across it. It protects you from the worst of the evil that lays across the mansion, but you can only watch, and spy, and try to learn each guest's secrets so you can save them from their bloody fate.