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When 13 year-old Charlotte Doyle boarded the Seahawk in June of 1832, she never dreamed that the crew would mutiny and that her life would be in danger.

Young Christina and Grant go on a Grand Canyon trip with their mystery-writer grandparents and set out to solve a spooky mystery with Danielle and Marisa, the daughters of a local park ranger.

The elite scientists of Sigma Force race to crack the ultimate mystery of mankind in a quest that will save or destroy the human race.

While on a transatlantic voyage to Europe, Samantha and Nellie discover there is a world-famous archaeologist on board who is carrying a legendary sapphire.

When sixteen-year-old Avery West learns her family is part of a powerful and dangerous secret society, and that her own life is in danger, she must follow a trail of clues across Europe.

Told in separate voices, Lena and Aubrey, each hiding their own secrets, set off in search of the truth about Charlie, including if he is really dead, after meeting at his funeral and learning that he was dating both of them.

Timmy is forced to hit the road in a cross-country trip that includes Timmy's mom, Total the polar bear, Doorman Dave, and smells-like-a-tangerine criminal mastermind Molly Moskins.

Traveling to Paris in 1907 with Grandmary and the Admiral, Samantha and her adopted sister Nellie suspect that someone is trying to harm their beloved grandfather and stop his secret government mission.

1930s: ranging from the rooftops of Paris to Scotland, Italy, and the Soviet Union, nineteen-year-old Vango is on the run???and seeking to discover his true identity.

"For centuries, the magnificent Throne of Felipe has stood with two empty spaces beside its famous silver arrow'spaces where the silver castle and lion should have been.

"Luna thinks it will be boring to stay at the historic Widmark Hotel while her mom is working to restore it.