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

While using her photographic memory to find her missing science fair project, Cam accidentally locates two valuable gold coins.

While solving the mystery of an old man's disappearing fortune, Nancy ends a family feud and reveals the identity of an orphan of unknown parentage.

A fifth-grader with a photographic memory and her friend Eric help solve the mystery of the stolen diamonds.

Frank and Joe race against time to retrieve a scientist’s top-secret invention before thieves get their hands on it. But the young detectives soon discover that they are involved in a mystery far greater in scope than just safeguarding the invention. When Joe is kidnapped, this incident starts Frank of on a chase that could end disastrously for him and his pals.

Nate the Great and his dog Sludge try to track down Claude's missing Stegosaurus stamp. Includes related facts, recipes, and activities.

Cam uses her photographic memory to identify the person who stole a valuable autographed baseball. When she notices some bones missing from a dinosaur skeleton exhibited in the museum, a young girl with a photographic memory tries to discover who has been taking them and why.

Nancy Drew must use clues in a dead man's letters to find some unpublished musical manuscripts that will save an old man and his granddaughter from financial ruin.

A brass-bound trunk mistakenly delivered to Nancy's cabin on a New York-bound ocean liner becomes the first clue leading her to suspect that international jewel thieves are aboard.

A fifth-grader uses her photographic memory, her mother, and her friend Eric to find a missing reel of a monster film they go to see.