Sadie has moved a lot, so now that she's transferring to a new high school, she makes sure to tell everyone that she has a peanut allergy. It helps her make a couple of friends, and the new school is going pretty well for her. Then she accidentally eats something that has nuts in it, and everyone finds out what happens to her: absolutely nothing. Because she made it up. 
 It lacks the warmth and depth of similar school-based friendship-oriented stories like Raina Telgemeier's Smile or Drama, but I think it can fit in with the same audience. The awkwardness of being The New Kid, of finding friends who aren't the cool kids... hard NOT to relate to!