Kate begins her epic journey following high in the hills of southern Oman. With her own supply of the precious resin, she walks with the Al Mahri tribe - the descendants of the ancient traders - and their 300 camels along the original trail through the scorching Empty Quarter desert. Crossing into Yemen, Kate arrives at the world's first skyscraper city, where her frankincense is used at the ritual blessing of a newborn baby. From the modern frankincense trade capital of Aden to an incredible camel-jumping contest, Kate journeys north and enters the mysterious Kingdom of Saudi Arabia.

Kate Humble follows the extraordinary path of the ancient frankincense trade route through one of the most enigmatic nations on earth - the Kingdom of Saudi Arabia. With unprecedented access, Kate enters the incredible world of the nation's richest man; she meets a remote mountain tribe whose ancestors once guarded the ancient trade routes and who live at the fringe of Saudi society today; and she discovers the treasures of an untouched and ancient shipwreck that once carried frankincense in the crystal clear waters of the Red Sea. Travelling by camel, glider and boat she traces the 1,000-mile trail through the Kingdom and discovers an amazing modern nation and its people.

Kate Humble crosses the Red Sea from Saudi Arabia to Egypt following the frankincense trail of the Pharaohs. Travelling the length of the Nile, Kate enters Karnak, the world's largest religious site. She looks at the mummy of the once beautiful Queen of the Pharaohs, reveals the death rituals of the Pharaohs in the vast tomb of the Pyramids of Giza, jostles with thousands of ecstatic Christians, and in an extraordinatry ceremony in the Sinai desert, she is cleansed of evil spirits.

In this final episode, Kate Humble concludes her remarkable frankincense trail from Oman, across seven nations to Jordan, and on to Israel and the Palestinian Territories. She reveals the secrets behind the ancient Jordanian stone city of Petra, flies with a daredevil female pilot over the Sinai desert, travels to the sacred city Jerusalem, and finds out why a small plot of land is the most contested site in the world. Kate ends her extraordinary journey following in the footsteps of the Three Wise Men to Bethlehem.