"Twelve-year-old twins Bickford and Rebecca Kidd and their two older siblings travel to Africa to track down priceless artifacts that will keep the family's treasure hunting business afloat long enough to rescue their kidnapped mother--and possibly find their missing father"--
When a set of priceless paintings by Leonardo da Vinci and Rembrandt go missing in Russia, the Kidd siblings head to St. Petersburg and the wild Arctic tundra to find the bad guys and locate the treasure.
Bick, Beck, Storm, and Tommy have one week to traverse the Australian Outback, locate Charlotte Badger and her pirate cronies, and find evidence to prove their parents innocent of stealing rare opals.
"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.
Eighteen-year-old twins Becca and Cassie, now trained, fearless fighters, hold the key to defeating the despotic United regime and freeing the people of the former United States, but at what cost?