Just as things were starting to come together, everything slipped away. A tragic series of events forces Kate to learn her love story backward while it keeps moving forward. Styles Not Prince

One day in his hotel room, Niall gets a package of twenty one letters. Twenty one letters about a girl who poured her heart out to Niall, a girl who is dying inside and is trying to fix herself again. As Niall begins to read, and the letters begin to run out, he finds himself knowing and loving this girl, all the while knowing that one day, he's going to have to stop reading. Because she stopped writing.