While I knew from the title page that Gut Reaction had two authors, I did not know they were next-door neighbors, not to mention mother (Kirby Larson) and daughter (Quinn Wyatt)! Kirby and Quinn collaborated on this novel about a middle schooler, Tess, who at first suffers alone with an embarrassing, painful, and debilitating condition that she (along with readers) comes to understand is Crohn’s disease, an illness Quinn knows firsthand.