Onion Jack has bought a piece of land on which to settle, but the property is still in possession of the orphans of the original owner and is coveted by the local oil baron.

Arms dealer Yolaf Peterson aims to make a sale to guerilla Mongo, but the money is locked in a bank safe, the combination known only to Professor Xantos, a prisoner of the Americans. Yolaf agrees to free Xantos, accompanied by reluctant guerilla Basco, but a former business partner of Yolaf's- John 'The Wooden Hand', has other ideas.