Lily Hippo is too loud. She sings too loudly, she laughs too loudly, and everyone knows when she is around. At home she disturbs the peace and wakes the baby. At school she gets her friends into trouble. She can't help it. But one day a new teacher, Miss Loopiola, comes to school to teach music and drama, and Lily discovers that she is doing exactly the right thing at last. When the school play comes around, Lily finds she is loud in just the right way.