Blake Crouch previously impressed me with his sci-fi thriller Dark Matter, which takes place across parallel universes. This time he has blown my mind with a novel, which is about time travel on the surface, but also about how memory works and informs who we are as individuals. To me, the sign of a good book is when you continue to absorb its ideas long after closing the cover. Recursion has had me thinking for weeks, especially about how we, as humans, experience time. A fascinating novel, which is also a heck of a page-turner.