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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.

Christina, Grant, Mimi, and Papa head for Hollywood, and run into a mystery complete with Hollywood glamour, historic handprints, a "waxy" museum, and an earthquake.

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.

Christina, Grant, Mimi, and Papa visit the world-famous Hershey Chocolate Factory on the 100th anniversary of the founding of the town and quickly become involved in a mystery involving stolen silver dollars.

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.

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.