In a winter wonderland, Nancy takes a walk on the wild side! Nancy, Bess, and George are staying at a rustic lodge in Wyoming, looking forward to fun winter sports like skiing and dogsledding. But their vacation plunges into mystery when Rainbow, the lodges tame pet wolf, suddenly disappears, leaving her five newborn pups motherless. Then Nancy learns that the lodge owners are creating a wolf sanctuary on their landand not everybody is happy. Was stealing Rainbow meant to be a warning? As Nancy investigates, her suspects include a hostile neighbor, a young wolf expert, and a handsome ranch hand. And if shes not careful, someone in the white wilderness will snow her under for good!