Santa is back for another Christmas journey across the world, and this time, he is loading his sleigh under the brilliance of the Northern Lights in the chilly Alaskan air. Armed with an ice scraper and snuggled inside his heavy red coat, Saint Nick prepares the team of flying caribou.

After surviving a hurricane in the Caribbean, ivory poachers in East Africa, and a Cairo crime syndicate racing up the Nile, zoologist Jack MacGregor, his paleontologist wife, Mavis, and children, Chris, Ryan, and Heather, head to the wilderness of Alaska and encounter an unusual new threat from ecoterrorists. As in all MacGregor Family Adventure Series novels, the MacGregors are once again caught in a web of intriguing characters full of danger, deception, and plenty of techno-thrilling surprises. Three Russian Orthodox priests seek the religious artifact the Cross of Charlemagne, while their rivals, a rogue Vatican priest and a renowned Polish archaeologist, are following a trail across Alaska left by early Russian settlers, hoping to reach the treasure first. Meanwhile, an ominous international team of ecoterrorists armed with state-of-the-art weapons are determined to prevent oil drilling in the Arctic National Wildlife Refuge and get rid of Jack MacGregor once and for all.