Over Christmas vacation, I positively devoured One Day. I absolutely loved it.
Dex and Em become friends on the day of their college graduation, July 15, and each year on that same date, we get to see the state of their relationship: it's ups and downs, hopes and frustrations. The book was sweet, sad, funny, hopeful, romantic, and charming. It's a quick read, but very satisfying. Honestly, in a year in which I've read a BUNCH of books, this one is at the top of the list. Read it.