Jane is a seventeen year old cancer survivor who want nothing more to live a normal life. One day her mum gives her a diary (much to her disappointment) and tells her to take down every moment in her life so that one day, she could look back at all the memories. Jane knows that her mum is worried that her cancer might recur and might she might lose her this time. Jane reluctantly agrees to her mum's wishes and starts to list down every moment that happens to her...Especially when she meets Harry Styles, the cheeky boy who seems to fancy her. She stars writing about all their moments together, how he's falling for her...and how she might love him back. And how he changed her life forever.