"Either you believe in possession or you do not. It is that simple, or at least that is how it often seems. However, the existence of the possession state in the human condition is not a matter of faith, it is a phenomenon that demands exploration." So begins the introduction of this psycho-spiritual exploration of involuntary (or demonic) possession. Avoiding the pitfalls of many such works, here is presented the inarguable fact that the possession state does occur and must be taken...