Nancy's good friend, Charlie, appears to be guilty of snake-napping from the River Heights Zoo. Meanwhile, George's brother, Scott, is being very sneaky and not acting like himself. Can these things be related? Nancy is about to find out.

While visiting Chicago with their grandfather, the Alden children begin receiving mysterious clues to a treasure hunt. Includes related puzzles, games, and activities.

When Eddie's baseball cards are missing, Jigsaw steps up to then plate. Solving this case is sure to send Jigsaw and Mila straight to the Detective's Hall of Fame.

Herculeah stumbles onto the trail of her friend Meat's long-lost father while she and Meat are investigating the disappearance of a dead body from the men's room of a comedy club.

Two rats escape from their comfortable life in an elementary school classroom and survive many dangerous adventures as they stow away on a pirate ship in search of a valuable statue.

When Hank the Cowdog, Head of Ranch Security, follows Little Alfred to an archaeological excavation, he runs into trouble in the form of a gorgeous golden-haired lady dog, a peanut butter sandwich, and an enticing, ancient, buffalo bone.

On the set of a science fiction television show, Frank and Joe explore a galaxy of danger.

At the same time that the Alden children's efforts to raise money for a new hospital wing are being sabotaged by nasty tricks, they find their attempts to befriend the new girl Beth frustrated by her strange behavior.

While vacationing on a tropical island, Frank and Joe Hardy endure "bad luck," face a dangerous typhoon, and struggle to solve a mystery.

While volunteering as a magazine delivery girl in a convalescent hospital during the Second World War, Molly uncovers a mystery involving the theft of rationed food supplies for sale on the black market.