After reading quite a few books on Exorcisms, I have come to the conclusion that nothing comes even close to Hostage to the Devil by Malachi Martin.
I could not get on with The Dark Sacrament at all, the majority of the stories were more about hauntings than actual possessions, to be honest I was bored. Beings appearing in what I perceived to be in the physical, doors opening and closing, things moving about, all these happenings were commonplace in nearly all the stories. All I can say is it is a damn good job that beings suddenly appearing in the physical are not commonplace or we would all be in peril!
A few things bothered me too, one was how come the Church are forever going on about how dangerous it is to use Mediums and yet one of the stories involved one of the Priests using one! Oh, they got round it by saying this person had the gift of Discernment, but when all was said and done, the person was a Medium and did what other mediumistic people can do.
I was also baffled how in the story that is still ongoing, the boy was sent away and told to say prayers every day. I thought possessed people were unable to say prayers and if he was not quite possessed at that point, bit risky I thought, to trust that he would say his prayers to keep the spirt at bay, yes or no?? Ironically, that same boy is in a dire position now and no longer wants any exorcism at all, cannot bear anything sacred and things are extremely dangerous for him in my opinion. Seeing as to how an exorcism cannot be given unless the permission of the afflicted is obtained, this case looks as if it will never be solved. Shame really, because the chance was at the beginning, now it looks like it is too late.