A San Francisco airplane bound for South America crashes, and among the scorched debris is found a shrunken native human head, neatly packaged. The perplexed police contact a local anthropology museum about this unclaimed piece of grisly baggage, where they intersect with Jack and Doc, two private eyes, called there to meet a mysterious woman who had a case for them and wanted to meet in private.

An innocent trucker takes it on the lam when he's accused of robbery.

A man who was falsly accused for murder escapes the sheriffs and starts a new life in a town at the border of the States to Mexico. But he cannot settle in peace as his chasers are trying to find him.

An Australian sheep man comes to Montana looking for grazing space, is opposed by local ranchers and a wealthy cattle-woman.