The idea behind the story... each time you make a major life decision it spins off another version of yourself, one where you did not make that decision. As a reader, I couldn't help but think about how many choices we make in our lives and how many versions there would be. Your head starts to spin.
But spinning isn't bad.
My full review can be found here at Rebeccas Reads. An excerpt:
Can you imagine being at the lowest point in your life and reviewing all your past decisions? Not just reviewing them, but meeting your alter egos who made different decisions. Thus is the basis of Parallel Lives, an intriguing story about a man struggling with life and past decisions. The story opens on Richard’s darkest day. He’s about to end it all when a voice yells, “Don’t do it! The repercussions are beyond your wildest dreams.” His savior is his counterpart in another reality, known as Historian.