Don't think about the science part so you can really enjoy this novel 😉

This was a fascinating mystery. A company can send you back to the past, for an hour, but you don't know where you'll go. You do know that the future will not be changed in any way too. 

Four strangers get sent to the same very tough day. Elizabeth lost her son, Andy lost a new love, Logan who was paralyzed, and Brooke who caused an accident. They work together to understand why they were sent to this point again and they come to find peace and a way to move forward. This is a book that just keeps you turning pages and feeling all the feelings with these people.