This visionary text professes to tell the complete story of Jesus' life, including the "lost" years, during which he traveled and studied in Tibet, Egypt, India, Persia, and Greece. First published in 1908, this mystical work is the cornerstone of a Christian denomination and offers intriguing, controversial assertions about Christ's message. Reprint of the C. F. Cazenove, London, 1908 edition.
Here's a sample of other books in this Dover category
The Lost Books of the Bible by William Hone, Jeremiah Jones, William Wake Excised from the standard bible by various church councils, these "lost" texts help to give depth to the historical characters of Jesus, Mary, the apostles, and other figures of the New Testament.
Pistis Sophia: The Gnostic Tradition of Mary Magdalene, Jesus, and His Disciples by G. R. S. Mead This important historical document chronicles the teachings of Jesus, who explains life's mysteries to his disciples and Mary Magdalene. Their discussions take place after Christ's resurrection and include accounts of his ascension.
The Kybalion: A Study of the Hermetic Philosophy of Ancient Egypt and Greece by Three Initiates This concise guide offers a modern interpretation of one of ancient mystical philosophy's greatest treasures. It condenses Hermetic doctrine into seven compelling principles that can be successfully applied to everyday life.