Architectural photographer Harriet Jeffries invites Police Inspector John Sanders on a short holiday. Flying to Santa Fe, John meets a group heading for a "Mysticism and Magic in Old New Mexico" bus tour. When the bus leaves without two eleven-year old passengers, Harriet and John pack the kids in their rental van and pursue. But the bus heads away from Taos, and the van comes upon a scene of terror, far from help. Some wounded and frightened, the trapped tourists face an unknown killer who emerges at night to stalk his victims. Harriet and John find new meaning in their relationship and in the power of good to overcome evil.