Six rustlers are being executed under the watchful eye of a cool California blonde. Now it looks as if Seth Logan and his mustang hunters are going to get the same rough justice - until the rancher's daughter, Marion Blaine, sees the pouch of opals given to Seth by a dying prospector. She persuades Seth to lead an expedition in search of the prospector's cave, but the men's lust for both riches and Marion explodes into murder and mayhem. Can Logan save the opals and the girl?