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

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

When Ruth Rose and her friends, vacationing in Florida, discover that her grandmother is about to invest in a project to recover sunken treasure, they stumble upon evidence that the entire plan may be a fraud.

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.

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.