Mimi, Papa, Christina, and Grant make an emergency landing on Diamond Shoals off the North Carolina coast and encounter a mysterious light on the beach.
Christina, Grant, Mimi, and Papa find themselves in the middle of a mystery in Death Valley, California. There's Aunt Erin, a creepy castle in the middle of nowhere, a ghost (or not?), temperatures hotter than a Fourth of July firecracker, and more!
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.
"Christina, Grant, Mimi and Papa snowmobile into Yellowstone National Park to encounter mud pots, geysers, bison, beauty, bears, volcanic action, and a mystery of historic proportions!"--p. [4] of cover.
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.
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.
Mimi, Papa, Christina, and Grant travel to Tombstone, Arizona, and find themselves helping new friends, Jorge and Rosita, uncover the secret of the haunted mine.
When they travel by train across America, Christina, Grant, Mimi, and Papa find themselves facing mysterious mishaps, spooky surprises, and treacherous tunnels.
Christina, Grant, and a couple of new friends learn a lot about astronauts and the history of the space program as they try to figure out who stole a valuable moon rock from Space Center Houston.
Christina, Grant, Mimi, and Papa head to the Great Smoky Mountains and end up in an A+ Appalachian mystery complete with an eerie mountain haze, spectacular scenery, a boisterous bear, confounding clues, and mystifying folklore!
Christina, Grant, Mimi, and Papa make their way to Mount Rushmore to check out the colossal carving of four presidents...and find a mountain's worth of mystery, history, precocious prairie dogs, quirky clues, befuddling Badlands, and one Crazy Horse!
Christina, Grant, Mimi, and Papa travel to Wyoming's Devils Tower and climb into a "towering" mystery involving Native Americans, precocious prairie dogs, fascinating footprints, Unidentified Flying Objects, and aliens?
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