In the flooded forests of the Peruvian Amazon lives one of the world's rarest and most mysterious primates, the red-faced uakari monkey. Local people call them English monkeys because of their resemblance to sunburnt visitors. Now there is a new Englishman on the scene, Mark Bowler, a young biologist who battles through the forest in his quest to understand the monkeys' secret lives. The film shows the first footage of these extraordinary animals in the wild and reveals why ice cream could be the greatest threat to their survival.