A rafting trip down the Rio Grande turns to terror when campers in a ghost town are knocked off one by one by an unseen killer. What else exactly is an unseen killer to do with his free time, after all? Their only chance to make it out alive may lie with an enigmatic cowboy who purports to have spent the last four decades tracking the murderous maniac. This creepy chiller produced during the golden age of the "slasher" era stars Pepper Martin, Hank Worden, and Woody Strode. 82 min. Widescreen; Soundtrack: English; audio commentary; theatrical trailer; more.