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When their favorite pizza restaurant almost goes out of business, the Alden children try to help their friends stay open while they find out who is behind all their problems.

When a puppy who is being trained as a police dog goes missing, third-grader Judy forms a detective agency to solve the mystery, imitating her literary heroine, Nancy Drew.

The Boxcar children travel to Maine, take canoes into the wilderness and live in a house exactly like the one on Surprise Island, except the Maine house is brown, not yellow.

One night, during a storm, the children find an old red boxcar that keeps them warm and safe.

Seeking to prove her father is not a mad conspiracy theorist, Gillian Seagret, her brother Eric, best friend Savannah, and NASA-obsessed schoolmate Howard uncover the secret doomsday bunker of Dr.

In 1940, during the Blitz, Katherine, Robbie and Amelie Bateson are sent north to a private school in Rookskill Castle in Scotland, a brooding place, haunted by dark magic from the past--but when some of their classmates disappear Katherine has to find out if the cause is hidden in the past or very much in the present.

The Alden children help their favorite Internet celebrity, Walter the cat, when he inherits millions from his owner and rumors begin to fly about his famous tricks being fake.

"The old abandoned school in Silver City is being fixed up as an art center and the Boxcar Children volunteer to help clean up the place.

Sibling sleuths Nick and Tesla must use solar-powered gadgets in order to outwit the criminal mastermind who has kidnapped their parents.

Jay finds more than he bargained for when he goes dumpster diving and comes up with a hot new computer game that is infected with a sinister virus.

Traveling to Antarctica for a prestigious science competition, twelve-year-old Jack and his genius foster siblings, Ava and Matt, become caught up in a mystery involving a missing scientist.

In an alternate history of New York, three kids try to solve a modern-world puzzle and complete a treasure hunt laid into the streets and buildings of the city.

"Harper doesn't trust her new home from the moment she steps inside, and the rumors are that the Raine family's new house is haunted.

"Every seven years, an important thing, like scent, disappears from the town of Sterling and Aila, sixteen, is determined to find the cause and how her recently-deceased mother was involved"--Provided by publisher.

"Working as a private investigator in eighteenth-century Bavaria, Gretel looks into the mysterious disappearance of sailors off the coast of Schleswig-Holstein and rumors of mermaids and sea creatures with the help of her brother, Hansel, and the captain of the ship Arabella"--Provided by publisher.