This book was reminiscent of the last book I read, The Future of Us, in how the smallest changes can have such a large impact. It's also very similar to Kate Atkinson's Life After Life, with the exception that the main character is aware that she is re-living her life and tries to make different choices. Major kudos to Lauren Oliver for writing a character that I initially disliked on many levels (I was NOT a 'mean girl' in school, and our protagonist Sam most certainly is) and opened my eyes to her journey of self-discovery. It starts out at face value as YA chick lit, but as the story unfolds, it gains real emotional heft. I find myself still thinking about it, after finishing it well over a week ago - highly recommend.