"Mystics At Prayer" by Lewis is a hardcover book published in 1960 as part of the Rosicrucian Library. Focusing on the topic of prayer, this book delves into the realm of religion and spirituality, making it a valuable addition to any collection or library. Written in English and printed in North America, this original edition offers a unique perspective on the subject matter, making it a sought-after item for those interested in the spiritual teachings of mysticism.