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On a cross-country vacation with their parents, twins Coke and Pepsi, soon to be thirteen, fend off strange assassins as they try to come to terms with their being part of a top-secret government organization known as The Genius Files.

Thirteen-year-old twins, Coke and Pepsi McDonald, continue their dangerous road trip across the country with their parents visiting famous attractions while being chased and nearly caught by mysterious forces.

"The wackiest road trip in history continues as the McDonald twins travel the Southwest dodging nefarious villains and visiting weird but true American landmarks"--Provided by publisher.

"Tween twins Coke and Pepsi McDonald have finally reached the last leg of their wacky and dangerous cross-country road trip, but they must fend off a host of strange assassins before they reach their home in California"--Provided by publisher.

Traveling to Antarctica for a prestigious science competition, twelve-year-old Jack and his genius foster siblings, Ava and Matt, become caught up in a mystery involving a missing scientist.

"Jack, his genius siblings, and inventor Hank Witherspoon go to Hawaii and help technology billionaire Ashley Hawking find out who is sabotaging her revolutionary electric plant that harvests energy from the deep ocean.