Mr. and Mrs. Watson have a pig named Mercy. Mercy is a porcine wonder. One night, Mercy decides she would like to snuggle up with Mr. and Mrs. Watson. This is not good news for the Watsons' bed. Or for the Watsons.

Mercy the pig's love of buttered toast leads to the capture of a small thief who would rather be a cowboy. Leroy Ninker is a small man with a big dream: he wants to be a cowboy, but for now he's just a thief. In fact, Leroy is robbing the Watsons' kitchen right this minute! As he drags the toaster across the counter -- screeeeeech -- and drops it into his bag -- clannngggg -- little does he know that a certain large pig who loves toast with a great...

When Mercy's appetite leads her straight to the bed of freshly-planted pansies next door, Eugenia Lincoln calls in Animal Control Officer Francine Poulet. But as Francine soon discovers, not just anyone can think like a pig - especially when that pig is a porcine wonder like Mercy Watson!

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...