In an unnamed country on the northern coast of South America, scientist Stanley is deeply embedded in the life of the rainforest. He's been studying a troop of capuchin monkeys for eight years--seven since his wife, Maria, left him, and their mentor, Professor Collymore, mysteriously disappeared. The country is preparing for a hotly contested election, which promises to unleash ancient tensions among the populace. Stanley, however, is oblivious to this, focused only on his research and his conviction that Maria will one day come back to him. But then his research is violently threatened: one of his beloved monkeys goes missing, and then another. Something is killing them, one by one. Stanley decides to take matters into his own hands, but soon learns that there are forces in the jungle as difficult to quell as the spirit of rebellion brewing in the south. Soon, Stanley finds everything he holds dear--his livelihood, his monkeys, his very life--in danger.