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Sue Perkins goes on an extraordinary journey, spanning over 1,500 miles, from the source of the Ganges high in the Himalayas to the Bay of Bengal. She travels through some of the most extraordinary, chaotic and exciting places on earth, exploring the lives and landscapes of modern India at this crucial point in its history.

In this first episode, Sue begins her journey in the highest mountains on earth. She treks to the source of the Ganges river and pokes her nose into the lives of hermits and the wise and wandering holy people that call this sacred landscape home. It's been a tough year for Sue since her father died, and walking where millions of pilgrims have walked before has a profound effect on her.

As winter approaches and the pilgrim season ends, Sue moves 20km downstream to the little town of Gangotri, joining the local pageantry festivities. It's a world that feels utterly timeless, but modernity is sweeping up this valley on a tide of tarmac, and the new influx of visitors - and their cash - to such a remote and fragile environment is changing life in the high mountains.

One hundred and sixty miles downstream, Sue arrives in Rishikesh - a town that has long been the gateway to the land of the gods and has drawn holy men and seekers of truth since time immemorial. Now it's an all-you-can-eat buffet of eastern mysticism. Sue goes shopping before heading to the Mahesh Maharishi Yogi Ashram, where The Beatles and the Maharishi turned the west on to Indian spirituality and put Rishikesh firmly on the world map.

Fifty years after The Beatles passed through, there are dozens of Ashrams now in Rishikesh. They're a sort of health spa for the soul, places where you can meditate, receive spiritual guidance and detox from the modern world. More and more westerners are being drawn to these quiet places and eastern religions. Sue books a short stay at one of Rishikesh's largest ashrams to try and understand why.

On Sue's last leg of the first stage of her journey, she arrives at the holy city of Haridwar, where the Ganges finally leaves the mountains and flows into the plains. Sue meets a holy man turned business guru who now runs one of India's fastest-growing consumer goods companies - packaging Hinduism for the masses. Together they tour his compound on an armed golf buggy, and Sue discovers what happens to spirituality when it enters the commercial world.

To complete this first leg, Sue attends the nightly Ganga Aarti ceremony on the banks of the Ganges in Haridwar. There are no tourists here, just normal, everyday people, who come to praise a sacred river and the goddess that lives in her. The sense of love and devotion here is utterly overwhelming.