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Christina, Grant, Benjamin, and Katherine become gridlocked in a mystery that takes them on a hair-raising history tour of New York City's most famous landmarks to find a priceless missing part of history.

Grant and Christina investigate the disappearance of a racehorse and two jockeys when they tag along with Mimi and Papa to the Kentucky Derby in Louisville, Kentucky.

Christina, Grant, Alexis, and Griffin try to locate the Wright Brother's historic plane, which has been stolen on the eve of the 110th anniversary of the brothers' first flight.

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.

Christina, Grant, Raven, and Hunter arrive in north Alaska for the Iditarod Trail dogsled race just in time to pursue a runaway team with a renegade musher.

Mystery follows Christina, Grant, Crystal, and Mick on their vacation to Disney World, where they need a little luck and loads of creativity to solve their latest case.

Christina and Grant, while on a trip with their grandparents to Niagara Falls, discover mysterious barrels tumbling down from the falls.

An emergency landing puts Mimi, Papa, Christina, and Grant in the middle of a mystery involving the deadly Diamond Shoals off the coast of North Carolina and shipwrecks.

The constitution in jeopardy is the real U.S. Constitution! Is it lost? Stolen? Fake? Real? Christina, Grand, and their new red, white, and blue friends follow the Constitution from its historic birth to its possible demise.

Mimi tells Christina and Grant a mystery story about North Carolina's Lost Colony, complete with two boisterous boys, kidnapped coins, a foggy graveyard, a missing friend, and moonlight trip on an old sailing ship.

Christina and Grant become caught up in an otherworldly mystery when they travel to Nevada and learn their friends, who have a ranch near Area 51, have been dealing with disappearing cattle.

When they travel by train across America, Christina, Grant, Mimi, and Papa find themselves facing mysterious mishaps, spooky surprises, and treacherous tunnels.

When a new shark species is discovered off the Carolina coast, Mimi and Papa take Avery and Evan to Palmetto Bluff to learn more about it.

When tarantula traps keep appearing (and disappearing!), the kids are drawn into a mystery they'll need all eight of their legs to solve!.

While researching one of Mimi's books in Detroit, Christina, Grant, Mimi, and Papa stumble upon a Motown musical mystery concerning classic cars, missing melodies, puzzling clues and lots of good music.