A girl with anxiety disorder finds an unlikely friend -- and emotional support animal -- in the form of an adorable fainting goat.

Twelve-year-old Marvel is afraid of absolutely everything-amusement park rides, food poisoning, earthquakes, and that big island of plastic floating through the ocean. She also obsesses about smaller worries like making friends, getting called on by the teacher, and walking home alone.


Her parents and the school therapist call her worries an anxiety disorder, but Marvel calls them armor. If something can happen, it will. She needs to be prepared.


But when Marvel stumbles on a group of older kids teasing a baby goat that has mysteriously shown up on the soccer field, she momentarily forgets to be afraid and rescues the frightened animal.


Only Butter isn't any old goat. She's a fainting goat. When Butter feels panic, she freezes up and falls over. Marvel knows exactly how Butter feels and precisely what Butter needs-her.


Soon, Butter and Marvel are going everywhere together, and Butter thrives under Marvel's support. Butter also helps Marvel. Everything is easier for her with Butter by her side. But just when Marvel starts to imagine a life in which she can manage her anxiety, instead of letting it control her, Butter's owner shows up to claim her. Will Marvel find a way to keep her friend? Or will she revert back to the anxious, lonely person she used to be?