Dak, Sera and Riq might be in over their heads when they attempt to stop a Viking invasion! When thousands of Viking warriors descend on medieval Paris, Dak is captured and forced to work with the invaders while Sera and Riq defend the city, a situation that places them on opposing sides.

Two roller-skating best friends--one tiny, one tall--share three comical adventures involving outrageously bright socks, an impromptu trek to the Andes, and a most unlikely marvelous companion.

"Following clues left by their missing father, twelve-year-old twins Bickford and Rebecca Kidd sail from the Caribbean to New York City with their siblings to finish the dangerous quest of their world-famous treasure-hunting parents"--Provided by publisher.