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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 are drawn into a colonial mystery involving a valuable map in Williamsburg, Virginia.

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 travel with Mimi and Papa to Mount Rushmore and get caught up in a mystery involving precocious prairie dogs and Crazy Horse.

Christina and Grant travel to Jamestown, Virginia, where they learn about colonial America and try to solve a mystery involving an archaeologist accused of stealing bones.

Michele, Michael, Jo Dee, and Brian set off on an adventure in North Carolina's pirate haunt port town of Bath, where they try to recover a special prop and save an outdoor drama while learning about the Golden Age of piracy.

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 and Grant are headed up the Mississippi River from New Orleans to meet Sam and Jake in St.

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.

Mimi, Papa, Christina, and Grant fly to San Francisco on a pleasure trip; but their relaxing vacation turns into a mystery that takes them through Chinatown and Alcatraz Prison.

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.

Christina, Grant, April, and Denise find themselves involved in a Christmas mystery that starts in Washington, D.