Ara has lost her dad, she didn't even get to say goodbye, her world is collapsing. Then, she gets a mysterious letter from him. This sets a chain of events that will help her overcome grief and find happiness in everyday things without her dad by her side. Theo is walking through life without much purpose. An aspiring author, he comes to Ara's life to quietly help her complete the tasks left to her in the letters. A wonderful put together story, cannot describe more of the story without spoiling it. This author has a gift with words.
It gets a little wordy in the middle, probably because we see the tale happening during a whole year but persevere. The last few chapters had me sobbing, they destroyed me. It took me a while to digest the content. 
This book will appeal to fans of The Notebook, P.S. I love you.