It's like Mean Girls go through Sliding Doors on Groundhog Day.
It starts, basically, with Sam's death. She's with her besties and bad things happen. The next morning, though, she wakes up. And it's the same day. She gets to re-live that same day 7 times in all.
And each day she learns something more. And each day she becomes a better and better person.
I really enjoyed this book and tore through it--did not want to put it down. Even had tears sting the back of my eyes at least once. It seems like it could get redundant, but it really does not.