The author hopes that his own book will be used as a source in treating Satanic ritual abuse. According to the dust jacket, Ryder is a licensed social worker and a certified chemical dependency counselor. Apparently he is not a psychologist or a psychiatrist. There is nothing in the book to indicate that he has been trained to do psychotherapy. Invoking the help of angels is not a recognized therapeutic tool, and requires more evidence to convince us than he provides.
Fabrication is known to occur in some therapies for recovery from incest.
The stories Ryder supplies are first person narratives with no interpretation, and are intended to be believed at face value. The author gives no evidence that these story-tellers exist or were treated by reputable therapists. Many of the stories he admits are composites. Perhaps the publisher believes this disclaimer will save it from later embarrassment or from a lawsuit.