Cammie Parker is just a normal, seventeen year old girl who just wants to fall in love with someone. So when she meets Harry Styles at a friend's party, they hit it off right away. But Cammie's not totally sure that Harry's "The One" so she puts their love on the line so she can figure it out. And when Niall Horan unexpectedly admits that he loves her, Cammie's life is turned upside down. And her decision might hurt more people than it should, considering she can only choose one.