The one is among us.
You wake up in a dark room with several other people and no memory of how you got there. None of the people you are with are familiar to you, but to escape from this place, you will have to place your trust in them. For it is a dangerous mansion, one with many traps and hostile beings.
But those words, written in blood on the wall... What do they mean? Is there more to your companions than you believe? Or perhaps even yourself?