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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.

While searching for more clues to the murder of his circus performer parents, talented magician Danny Woo follows the Mysterium circus to Barcelona, where he discovers a traitor and a dangerous woman in green.

"Mr. Quisling is definitely up to something mysterious, and Emily and James are on high alert.

This time Cleo, Evan, and Ms. Crowley (who, it turns out, is the missing Ms.

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.

Twelve-year-old Addison Cook and his friends are on the hunt for a long-lost treasure.

"Jack, his genius siblings, and inventor Hank Witherspoon go to Hawaii and help technology billionaire Ashley Hawking find out who is sabotaging her revolutionary electric plant that harvests energy from the deep ocean.

On the morning of June 12, 1962, guards at Alcatraz Prison discovered that inmates Frank Lee Morris, John William Anglin, and Clarence Anglin were missing from their cells.

"When Rennie's dad, the Major, goes overseas on assignment, he enlists his mother-in-law to babysit Rennie.

Aspiring Professional Adventurer Mr. Penguin and his colleague, Colin the spider, try to find a treasure rumored to be buried in The Museum of Extraordinary Objects before bandits do.