After Mercy Watson follows the delightful scent and delicious taste of the pansies her thoughtful neighbors plant to beautify their yard, animal control officer Francine Poulet is called out to handle the case, which brings unexpected results.

While bumbling PI Percival Smidgely tries to find missing pig Mercy Watson, a trio of clever neighborhood sleuths follow a trail of hoof prints - and a delicious aroma - to recover their porcine wonder, in this uproariously funny, extra-special series finale.

Mr. Watson's usual Saturday drive in his Cadillac with his favorite pig, Mercy, turns into an adventure when an unexpected passenger shows up in the back seat and Mercy finds herself behind the wheel.

"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,...

After Mercy the pig snuggles to sleep with the Watsons, all three awaken with the bed teetering on the edge of a big hole in the floor.