Dr. Helen Wambach's book is an account of her research into the phenomenon that is the recollection of past lives. It relates to work she conducted back in the 70's but it is a good introduction to more recent work conducted by people like Dr. Brian Weiss. It is academic and can be a bit dry and repetitive in places, but her work is scientifically-based and uses a large and statistically significant number of subjects.
Wambach's conclusion that we have more than one life is important for anyone looking for the truth of the human condition and has enormous implications for those in search of philosophy's holy grail: discovering "How to Best Live?" - if we have had many lives, and have many more to come (reportedly as members of either sex and of various religions, races, nationalities, and socioeconomic classes) we should reconsider any sexism, racism, xenophobia, parochialism, economic unfairness, and religious hatreds that we may now be instituting - if for no other reason than such hatreds etc. may be visited upon our selves in the future. Likewise, we should reconsider more closely our present economic and environmental sustainability - the present I.B.G. ("I'll Be Gone") mantra employed by many of our business, religious, and political leaders may backfire!?
Wambach's research was conducted using hypnosis and a significant number of her subjects reported similar past-life memories - many containing historically verifiable details not known by the subjects in this life. While hypnotherapy has recently had some bad press (early childhood recall which was led by the therapists) hypnosis remains a valid tool in the hands of good practitioners. Wambach was academically qualified and her study was as objective as possible, and while none to my knowledge have used such a large group of subjects, some subsequent credible researchers have had corroborative findings. Such work as hers requires close and non-fundamentalist consideration if we are serious about the survival of our species.