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.

When Stella gets the sudden idea to go caroling, she has a little trouble getting someone to join her. Her brother, Frank, is not good at spontaneity. The Watsons are very involved in a precarious fruitcake attempt (but happy to send their pig, Mercy, out for the occasion). Eugenia Lincoln declines, a bit rudely, to accompany on her accordion, and Horace Broom is too busy studying planetary movement. Will Stella need to sing by herself--with enthusiastic...

A constant worrier, Franklin Endicott earns a fresh cause for alarm when he accompanies Eugenia Lincoln to her favorite thrift shop and leaves with a mystery to solve.

El Sr. y la Sra. Watson tienen una cerda llamada Mercy: una verdadera maravilla porcina. Como se acerca la noche de Halloween, los Watsons ya tienen pensado el disfraz perfecto para Mercy. Para convencerla de que se ponga el traje, le prometen que los vecinos le darán algo delicioso. ¿Qué puede ser más divertido que la aventura de ir a pedir golosinas? En especial, cuando hay una persecución en el medio de todo.

Mercy the pig's love of buttered toast leads to the capture of a small thief who would rather be a cowboy.