Lt. Thomas Mullin may be retired from the U.S. Calvary, but he's still considered the best tracker around. So when a senator's son turns up missing, Mullin is the man called upon to find him. It doesn't take long for Mullin to figure out that quite a few travelers and cowboys have disappeared recently in the same area. And the desolate, inhospitable land is offering no clues—only shallow graves. As he investigates further, Mullin finds himself pitted against a killer stranger and deadlier than any he's faced before.