Growing up, goody-two-shoes Kirra Jacobs and troublemaker Reef McKenna were always at odds. Now paired together on Yancey's canine search-and-rescue unit, they begin to put aside old arguments as they come to see each other in a different light. Then a call comes in from the Iditarod (the 1000 mile annual Alaskan dog sled race from Anchorage to Nome widely considered to be the last great race on Earth) that will push them to their limits.

Kirra's uncle, a musher in the race, has disappeared. Kirra and Reef quickly track the man, but what they discover is harrowing. Frank's daughter has been kidnapped. In order to save her, the man must use his knowledge as a mechanical engineer to do the kidnapper's bidding or she will die. Kirra and Reef, along with the entire McKenna family, are thrown into a race to stop a shadowy villain who is not only threatening a girl's life, but appears willing to unleash one of the largest disasters Alaska has ever seen.