Twelve-year-old Neon Blue Greene is queen of the cafeteria, co-captain of the cheerleading squad, and has the most amazing dog any seventh grader could ask for. Her only complaint in life is that her parents named her after the color of a sports energy drink until the morning she overhears them whispering and learns that she has twenty-eight days left to live. Neon needs a miracle, but how can she get one in only twenty-eight days? Then it hits her. She'll do a good deed every day.

She starts doing good deeds for everyone in town, from motorcycle gang dropout Knuckles Malone to her autistic classmate Bobby, who becomes a hero and friend when she needs one most.

But when her best friends ditch her and her good deeds go sideways, Neon wonders if she'll get the miracle she needs ... before it's too late.