Lost race and adult fantasy fiction

There is a man who has lost his wife and daughter. He is the sole survivor in the accident and feels great guilt. And in this guilt, he begins to drink more and more each day. Then one day as the man was contemplating suicide, a stranger named Joren comes along and tells him not to worry. He tells him of reincarnated souls, of a life beyond the mortal one, and he teaches the man to transcend his physical body. But will he like what he finds on the other side?

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