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Christina, Grant, Mimi, and Papa visit the peaceful Cape Cod National Seashore, only to find themselves awash in a mystery filled with troubling tire tracks, shifting sand dunes, a lonely lighthouse, and warnings of an approaching Nor'easter.

Christina, Grant, Mimi, and Papa find themselves in the middle of a mystery in Death Valley, California with 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, 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?.

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.