Tristan and Vanessa travel to the majestic "Blue City" of Jodhpur in Northern India to film a dramatic event in the lives of some very sacred primates – the Hanuman langurs.

Jodhpur is built on a desert oasis, and the langurs take full advantage of the perks of city life and live on the rooftops. Far from being pests, these langurs are worshipped by Jodhpur’s residents, who believe they are the living incarnations of the Hindu monkey god, Hanuman. Tristan and Vanessa learn firsthand about India’s deep spiritual connection between humans and animals.

Tristan and Vanessa embark on their mission to film a marauding gang of bachelor langurs as they attempt to depose an alpha male and take control of another troop of langurs. Quickly learning the local customs and etiquette, Vanessa negotiates access to a network of more than 40 rooftops so that Tristan can catch all the action.

After several days, Tristan and Vanessa head to the great Thar Desert to film another langur troop. En route, they visit a Bishnoi village, where the residents are known as the first conservationists. The villagers worship a small antelope called the "blackbuck."

Tristan and Vanessa discover that primates and antelopes aren’t the only animals that have special relevance in this part of the world. Tristan and Vanessa visit the Karni Matah Temple, home to thousands of scampering brown rats. These rats are believed to carry the souls of holy people who’ve died. Worshippers bring food and milk as offerings, and it’s considered sacred when the rats partially eat the food. Through their cameras, Tristan and Vanessa share this rare experience at the rat temple.

Back on the trail of the monkey warriors, Tristan and Vanessa arrive at the red cliffs of Daijar, home to a harem of more than 100 langurs. Here, on a daily basis, the alpha male is challenged by a 20-strong group of bachelors. He is injured and looking weak; can he keep control? The days that follow are crucial, and Tristan and Vanessa document this rare and dramatic event in the lives of India’s sacred langurs.