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

Dink and his friends investigate why pets, like Mrs. Davis's canary, Mozart, are mysteriously disappearing all over town.

Dink and his friends unearth the mysterious truth behind the envelopes incorrectly delivered to his house.

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

Dink and his two friends help Lucky find the culprit who stole Lucky's winning lottery ticket.

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.

When Dink, Josh, and Ruth Rose visit a dude ranch in Montana, they find themselves with another mystery to solve, this one involving the theft of money from the ranch's safe and of a large gold nugget that Josh had found.

When someone steals the money the town has been collecting to help the ducks, Josh and his friends try to find the thief.

The deadly dungeon: While visiting Wallis's castle, Dink and his friends investigate strange noises that lead them to a dangerous secret. The empty envelope: Dink and his friends unearth the mysterious truth behind the envelopes incorrectly delivered to his house. The falcon's feathers: Josh and his two friends look for the person who stole a peregrine falcon from its nest. The goose's gold: When Ruth Rose and her friends, vacationing in Florida,...

At Green Lawn Elementary, the entire school becomes involved in a mystery when Mr. Bones, the skeleton in the nurse's office, disappears.