4.5-5 stars. 
 I'm so glad that I picked this up on a whim. I was deciding between this book, one I had not even heard of, and one that I had wanted to read for a while but read mixed reviews on. 
 I loved this book from start to finish, I could see some of the ~twists~ from a mile off, but I didn't mind. I loved the writing style and Sammie was a delight. Coop was my favourite, as well as the siblings. ("SURPRISE!") I loved the little stories into their "futures", and their letters. 
 SEMI-SPOILERY BUT NOT REALLY: 
 I could feel Sam's parents' hearts breaking, and the ending made me cry big fat tears. The only thing I would have liked more of is a better resolution with Maddie, but I get that in life that doesn't really happen either. 
 Overall, I really, truly loved this. One of my favourite reads this year.