Everything about Mara Carlyle's senior year proceeds normally, until a classmate, Katelyn Ogden, literally explodes in third period pre-calc. The FBI gets involved, and soon Mara's last high school year is filled with romance, quarantine, hallucinogenic mushrooms, friendship promising to be lifelong, bloggers, Bon Jovi, an ice-cream truck, and some filthy language from the president of the United States.