Overview: In this book, Andre Luiz analyzes the various aspects of mediumship, emphasizing the efforts of mediums faithful to the spiritual mandate received prior to their reincarnation. He also warns of the risks involved in the poor interchange between the two worlds. It talks about trance, somnambulism, possession, clairvoyance, the out-of-body experience, fascination, psychometry and the mediumship of physical effect, among others. It is a technical study of great relevance, which discloses the ways in which Spirits act during intricate processes of communication with the incarnates. It relays concepts of spirituality, received from enlightened mentors, contained in explanations of philosophical, scientific and evangelical nature, indispensable to those who dedicate to the study of mediumship.