What a mind-bending, entirely original book. If you've ever read about (and been intrigued by) Schrödinger's Cat, you will love this book. (If you haven't heard of Schrödiner's Cat, this is a good explainer: www.iflscience.com/physics/schr%C3%B6dinger%E2%80%99s-cat-explained/) At the center of the book is quantum superposition – which sets the stage for a thoroughly fascinating exploration of fundamental concepts of identity, love, regret, fate, and more. Loved the main characters, thrilled by the way [a:Blake Crouch|442240|Blake Crouch|https://d2arxad8u2l0g7.cloudfront.net/authors/1264134132p2/442240.jpg] wove some very weighty physics into a completely engrossing fictional conflict. Just a wonderful read.