Dink Duncan and his two friends investigate the apparent kidnapping of famous mystery author Wallis Wallace.

The Aldens realize the food their dog, Watch, is eating in a commercial and enjoying is not the same as what is being sold in stores, and must decide whether they should continue to allow him to work for the dishonest company.

When the children uncover a strange puzzle in a friend's back yard, it's the start of a "spy game" leading to gold. But first they must make sense of an old photo and a riddle, and learn just who is behind this mystery within a mystery.

Henry, Jessie, Violet, and Benny discover that some of the clues to the Great Detective Race are fake and set out to find out who is trying to ruin the race.

While volunteering at a rescue ranch, the Alden children investigate the disappearance of a few horses.

Displaying their best work at school in preparation for Parents' Day, Nancy and her sidekick, Bree, are on the case when a prized possession goes missing, in a first chapter book starring the irrepressible Fancy Nancy.

When the Boxcar children help out in a local garden, they dig up one strange thing after another! First, the tomato plants seem to move every day. Find out how that can be.

Because they do not want to be separated, four orphaned children run away and live in an old abandoned boxcar

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.