Stella Endicott loves her teacher, Miss Liliana, and she is thrilled when the class is assigned to write a poem. Stella crafts a beautiful poem about Mercy Watson, the pig who lives next door -- a poem complete with a metaphor and full of curiosity and courage. But Horace Broom, Stella's irritating classmate, insists that Stella's poem is full of lies and that pigs do not live in houses. And when Stella and Horace get into a shouting match in the classroom, Miss Liliana banishes them to the principal's office. Will the two of them find a way to turn this opposite-of-a-poem day around?