Dink Duncan and his two friends investigate the apparent kidnapping of famous mystery author Wallis Wallace. A is for author ... Dink writes to his favorite author, mystery writer Wallis Wallace, and invites him to visit Green Lawn. To Dink's amazement, Wallace says he'll come! But when the big day arrives, Wallace is nowhere to be found. The police think he just missed his plane, but Dink suspects foul play. It's up to Dink and his two best friends,...

X is for X-ray...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. They are having an excellent time at the Penelope Gwinn concert. But during intermission, Dink injures his arm and, at the same time, the diamond necklace mysteriously disappears. Could the two events be connected? Could Dink's X-ray be a clue?

Reports of zombies and grave-robbers alarm the people of a Louisiana swampland village, but Ruth Rose, Josh, and Dink begin to suspect that the supernatural may not be the cause of the eerie occurrences.

Dink, Josh, and Ruth Rose investigate a mysterious man in black who Josh believes is a vampire.

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.

While visiting their friend Wallis and her adopted daughter on Mount Desert Island, Maine, Josh, Dink, and Ruth Rose investigate why three white wolf cubs were stolen, and by whom. W is for Wolf. ... Dink, Josh, and Ruth Rose are thrilled to visit Wallis Wallace at her new cabin in the Maine wilderness. On their very first day, they glimpse a white wolf and her babies on a cliff. But soon after the kids spy the wolf family, the pups are wolf-napped!...

Dink, Josh, and Ruth Rose investigate the kidnapping of the new baby panda at the petting zoo.

Dink and his friends meet an exchange student, Sammi, who is actually the prince of an island country, hiding from those enemies who have kidnapped his parents and who may be after him, as well.

Dink, Josh, and Ruth Rose are enjoying Halloween fun in Sleepy Hollow, New York, but when unplanned spooky things start happening, they investigate whether a real headless horseman might be to blame.

When the guests of the Shangri-La Hotel are scared away by a white-haired female ghost, Dink and his friends investigate the mystery.