Action director Don Siegel (Dirty Harry, Invasion of the Body Snatchers) directs this fast-paced western with beloved character actors Edgar Buchanan and Jack Elam supporting the action. Sheriff Les Martin (Cornel Wilde, the Naked Prey, Leave Her to Heaven) is puzzled in his investigation of three mysterious murders near the Grand Canyon. Lacking any clues, Les enlists his girlfriend Janice Kendon (Victoria Shaw, the Eddy Duchin Story), daughter of a retired mine owner, and bartender Scotty O'Brien (Mickey Shaughnessy) to help with the case. When Janice's brother, Bob (Rian Garrick), leads Les and Janice to a rendezvous with an associate in the middle of it all, Sheriff Martin is drawn into a dangerous - and deadly - chase high above the Grand Canyon's floor.