The First Fifteen Lives of Harry August by Claire North [Kindle]
Loved this book.
Claire North takes a cool premise and explores it wonderfully, with an engaging plot.
The premise: Some people live their life over and over. After they die, they restart at the beginning, remembering their previous loops at age 3 or 4. It gives a time-traveler-esque feel to the story line, and the conceit is well executed.
The butterfly effect is handled ok, but there remains the Grandfather’s Sperm Paradox* which, if considered closely, unravels some of the plot.
But, there is so much awesomeness in this one, I don’t mind a little hand waving.
*The Grandfather’s Paradox states you wink out of existence if you go back in time and kill your grandfather, but really all you need to do is bump him a little.
The only portrayal I’ve seen of this is in the very enjoyable movie “About Time”, where a man learns he can travel back along his own timeline and change his history. He discovers if he travels back further than the conception of his child, he ends up with a different child in the present.