Recursion by Blake Crouch has been described as a science fiction puzzle box.
Barry Sutton is an NYPD detective. He is currently investigating a False Memory death. Recently some people have been plagued with what feels like real memories of their lives that never happened - years of other lives suddenly in their brains.
Helena Smith is a neuroscientist studying the brain to try and solve Alzheimer's, a disease affecting her mother. She is working on a chair that can save memories that could be re-loaded into people's brains when their originals ones are not accessible.
But her memory chair does more than that. Using a described memory, a person can be sent back to that moment. But everyone else effected - anyone in the room with you or who you met after that point - goes too. The chair tests our ideas about how time itself works.
Crouch is a great thriller and science writer. His books have been turned into movies and tv shows. This one is very thought provoking. Not since Replay by Ken Grimwood have I read a book that stays in my head for so long. Get this book from you library today!
Crouch, Blake. (2019). Recursion. New York: Crown.