The document summarizes the young adult novel "To All the Boys I've Loved Before" by Jenny Han. It lists the main characters as Lara Jean Covey, her love interests Peter and Josh, and her sisters Margot and Kitty. It provides a brief plot summary, noting that Lara Jean writes letters to her crushes but doesn't send them, until her sister Kitty mails them out by accident. As Lara Jean deals with her past loves confronting her about the letters, she discovers that something good may come of the situation.