For years, Regan's brother Liam has been nursing a secret. By day, he is Liam, a passably typical boy of his age; at night, he transforms himself into Luna, his true, female self. Regan loves and supports her brother and she keeps his Liam/Luna secret. Things change, though, when Luna decides to emerge from her cocoon. She begins dressing like a girl in public; first at the mall; then at school; then at home. Regan worries that her brother's transgender identity is threatening her own slippery hold on normalcy.