London has a condition where when she goes to bed her memory gets 'erased'. The next day she reads notes from herself, and has 'memories' of the future. This has been okay for her until she meets Luke. She likes Luke a lot but try as she might, she can't remember him. Meaning, he has no place in her future. The more she tries to figure out why she can't see him in her future, the more her past comes back to haunt her.
As I said I quite enjoyed this book. It made me thankful to have a semi-working memory.