A week before her twenty-fifth birthday, Luna, a young woman in Los Angeles is diagnosed with a deadly brain tumor and is told she has six months to live. What follows is not only her diary that she leaves behind for her little sister, but also a handbook for the reader — a raw and intimate guide to being alive when time is short. As she plans her last birthday, attends her last family vacation, and falls in love for the final time, Luna discovers that she has been living all wrong. And while she shares her journey with readers, she keeps her diagnosis a secret from everyone except her parents. Written in a voice that breaks the fourth wall and speaks directly to the audience, the book carries readers through her last months as she wrestles with mortality, love, meaning, and what it really means to be alive. Blending narrative and self-help, How to Live; Written by a Girl Who’s Going to Die offers wisdom wrapped in story.