All 12 jury members who sent an innocent man to the gallows are gathered together for a demonstration of how convictions can be made on circumstantial evidence. During the proceedings, a phony murder is quickly revealed as the real thing.

Profiteer Alexander Stiles lays claim to a million acres of range in the Pecos River country, but a rancher named Claybor stands in his way as he has already claimed the water-rich location of Sweetwater as his own.