The Judas Metal — Gillian F. Taylor

Pat Williams and Robson Hyde are a successful partnership, having gained control of flourishing silver mine down in southwest Texas. But when bandits begin to ambush the loads of silver bullion, things change. They discover that the bandits' knowledge of the route was so precise that they had to have inside information, and as Hyde struggles to discover who is behind the attacks, a resentful enemy starts to sow the seeds of doubt in Williams' mind. Does Hyde want all the silver for himself? Unchecked, suspicion turns to fear and the pair's friendship comes to an abrupt end with a violent death at the silver mine.