Eighteen months ago, Aleut Kate Shugak quit her job investigating sex crimes for the Anchorage DAs office and retreated to her fathers homestead in a national park in the interior of Alaska. But the world has a way of beating a path to her door, however remote. In the middle of one of the bitterest Decembers in recent memory ex-boss and ex-lover Jack Morgan shows up with an FBI agent in tow. A Park ranger with powerful relatives is missing, and now the investigator Jack sent in to look for him is missing, too. Reluctantly, Kate, along with Mutt, her half-wolf, half-husky sidekick, leaves her wilderness refuge to follow a frozen trail through the Park, twenty thousand square miles of mountain and tundra sparsely populated with hunters, fishermen, trappers, mushers, pilots and homesteaders.