Essie is a thirteen-year-old girl feeling glum about starting a new school after her professor dad takes a temporary teaching position in a different town. She has 110 days here and can't wait for them to end. Then she meets Ollie: delicate, blue eyes, short hair, easy smile. At first, Essie thinks she has a typical crush on a beautiful boy. But as her crush blossoms, she soon realizes that Ollie is not a boy or a girl, but gender non-binary.