It is December 1880 and snow covers the town of Devil's Lake in northern Dakota Territory, where there have recently been two connected killings on the outlying homesteads. Angie Sutter, the attractive young widow of one of the murdered men arrives in town, seeking help from local marshal Rance Toller. But having jailed a particularly menacing individual who appears out of place in such a quiet town Rance is reluctant to head out into the frozen wasteland, especially as there is only an ageing deputy to stand guard. On returning to Devil's Lake, Rance and Angie find the deputy dead and the prisoner gone...