A mate on a whaling boat doesn't know if the greater danger lies with the predators of the deep or with the treacherous Russian pirates who would steal a man's fair catch. A mighty beast who refuses to be caught answers that question, bringing rough justice to the seas.
A hunter has set his goal to bag a Jaguar, and has hired a wizened tribesman as guide for his jungle hunt. When the legendary cat, named El Diablo by the villagers, returns, the hunter has met his match, and finds that he must heed the words of his guide if he is to survive.
An engineer is sent in to swamp country with the job of surveying it so it can be drained for farmland. He meets the fierce and resistant people, and earns a reluctant guide, who plots to kill him. The engineer survives through a combination of toughness and compassion, and earns the respect of the swamp people.
One trapper stops another from treating his pack dog cruelly, and earns an enemy in the process. He adapts the dog, which he names Trouble, and the dog becomes an invaluable help in the conflicts that lay ahead.