It's been three months since Augustus Waters passed and left Hazel alone and heartbroken. She can't help herself from dwelling on the pain of his untimely death rather than cherishing the memories they shared, resulting in isolating herself from everyone. Hazel is quite certain that she would rather join Augustus than live in a world without him. Until a mysterious letter arrives in the mail and she finally does venture outdoors. Her recovery relies on the words of a boy she's never met and the love she still feels from someone who isn't with her anymmore. Hazel's story hasn't been left on a sad note and Charlie's letters haven't been lost or forgotten.