While visiting Wallis's castle, Dink and his friends investigate strange noises that lead them to a dangerous secret.

When the umpire at the baseball game fundraiser is accused of stealing a collection of autographed baseballs, Dink, Josh, and Ruth Rose try to prove his innocence.

Third-grader Dink and his detective friends hope to receive a big reward by finding the person whose video recorder picked up a picture of the local bank robber.

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

When KC and Marshall see lights flickering at night in the Washington Monument, their investigation turns up a monkey, a hole in one of the monument stones, and a hundred-year-old mystery.

The absent author: Dink Duncan and his two friends investigate the apparent kidnapping of famous mystery author Wallis Wallace. The bald bandit: Third-grader Dink and his detective friends hope to receive a big reward by finding the person whose video recorder picked up a picture of the local bank robber. The canary caper: Dink and his friends investigate why pets, like Mrs. Davis's canary, Mozart, are mysteriously disappearing all over town.

Josh and his two friends look for the person who stole a peregrine falcon from its nest.

Ruth Rose, Josh, and Dink attend a concert during which someone steals the star's diamond pendant, and they are soon on the trail of the thief. X is for X-RAY - Dink, Josh, and Ruth Rose are having an excellent time at the Penelope Gwinn concert. But during intermission, Dink injures his arm! At the same time, the singer's diamond necklace is stolen. Could the two mishaps somehow be connected? And could Dink's X-ray be a clue? It's up to the kids...

While picnicking on Squaw Island, Dink, Josh, and Ruth Rose find a hundred dollar bill, and when they return to explore further they find an entire cave full of money.

Dink, Josh, and Ruth Rose investigate the disappearance of a valuable racehorse that Dink's uncle and his friend, Forest Evans, have just bought and entered in a race at Saratoga.