William Walker Atkinson 
Reincarnation and the Law of Karma [PDF ebook] 
The Old-New World-Doctrine of Rebirth, and Spiritual Cause and Effect

What happens to the soul after death? Do we go on to be reborn in another body, or are we transported to some as-yet-unknown astral plane? Regardless of what your stance on the concept of reincarnation might be, this comprehensive introduction to the subject — written by renowned New Thought expert William Walker Atkinson — is an engrossing and enlightening read.