Evan is a socially awkward teen who struggles to make friends while being his introverted, cumbersome self. To help with this, his therapist advises him to write letters for himself, in order to let his emotions flow out onto paper. One of the letters happens to make it into the hands of Connor Murphy, a teen who struggles with severe depression. When Connor commits suicide soon after finding the letter, Evan blames himself, and this sparks the heart-wrenching plot that all young teens absolutely adore.
As soon as Hazel Grace Lancaster takes a glance at Gus Waters, she instantly falls in love. They met in a cancer support group, and share a common interest in the book "An Imperial Affliction". Gus takes Hazel on a trip to meet the author, but the romantic tale takes a twisted turn as Gus reveals a secret that leaves Hazel devastated.
Laura Jean Covey has always fantasized about the idea of love. However, she never tells anyone that she has a crush on them. Instead, she writes thoughtful and touching letters to each of her crushes confessing her love for them... but never mails them, for that could end in disaster. Later in the story, her worst fear is confirmed as every single one of her letters is mailed to each of the boys, and begins an intense teen drama that will keep readers on their toes.
Emotionally, Maddy Whittier seems to be perfectly fine. She is intelligent, curious, and realistic. However, she is diagnosed with severe combined immunodeficiency (SCID), which makes her unable to leave the comfort of her house. Ever. Her diagnosis does not diminish her crush on her new neighbor: Olly. From a few glances through the window and some texts, Maddy and Olly form a connection that is yet to be broken. Together they risk everything.