Cassidy Newman has lived every fan girls dream, she's spent part of her summer with the worlds most famous boy band... her only problem is she doesn't remember any of it. Now she has to reacquaint herself with her friends as they go on one of their biggest tours yet. Having the feeling that her friends are hiding something from her, she must try to put the pieces of her missing summer back together.

When Grace happens to cross paths with Niall Horan, she is suddenly pulled in by his charm. She has always been the girl to show very little emotion but there is something about the flawless boy that she can't resist. He challenges her in ways she never imagined. Niall brings out the best of her. Will it always be that way? What will happen when the fans find out about Grace? Will she forget the boy who changed her life and move on?