People commit unthinkable acts every day. Time and again, we grapple to understand what drives a person to do such terrible things. But what if all of the questions we're asking are wrong? What if the cause of all evil is not a matter of what...but who? When three college friends stumble upon the horrific origins of the Bye Bye Man, they discover that there is only one way to avoid his curse: don't think it, don't say it. But once the Bye Bye Man gets inside your head, he takes control. Is there a way to survive his possession?