On the run from police in America, Antonio Morena, a former World War II aviator and black-marketeer, finds himself in South America working for the all-powerful United Fruit Company, known to the natives as "the Green Monster".

The Germanic pagan deity, The Rainmaker, has fallen asleep, causing widespread drought and poverty. A young couple, Andreas and Maren must trick an old goblin into leading them to the magic garden of The Rainmaker and wake her up.