From the author and illustrator of the bestselling Not Quite Narwhal comes a sweet and funny story about remembering where you belong no matter how far you roam or what you re wearing when you get there. Harriet loves costumes. She wears them to the dentist to the supermarket and most importantly to her super-special dress-up birthday party. Her dads have decorated everything for the party and Harriet has her most favorite costume all picked out for the big day. There s just one thing missing--party hats! But when Harriet dons her special penguin errand-running costume and sets out to find the perfect ones she finds something else instead--real penguins! Harriet gets carried away with the flock. She may look like a penguin but she s not so sure she belongs in the arctic. Can Harriet manage her way back to her dads (and the party hats!) in time for her special day?