To discover the origins of these people and their civilization that flowered long before Alexander’s arrival David enters one of the least visited places on earth – the Wakhan Corridor. With a caravan of twenty-five yaks, horses and handlers, he begins the final leg of his Quest for Alexander’s lost world and experiences what it was like for Alexander’s army to live and fight in the high passes on the roof of the world.

In the waters of the Oxus River Adams discovers a surprising connection to Jason and the Argonauts – could they have possibly travelled this far from Greece? David explores the riches that had drawn Alexander and the Greeks, following the ancient trade route deep into in remotest Badakshan to discover more of its ancient civilization.

Crossing back into Afghanistan, Adams continues his search for Alexander’s Lost Cities. Lost in a sand storm in the desert, he and cameraman Greg finally reach a remote police outpost in the Taliban held Kunduz delta. The police take him deeper into the delta to the vast fortress known as Qy-i-Zal, believed to be one of Alexander’s bases.

Did Alexander really build sixteen cities in Afghanistan and Central Asia or was he the destroyer of a far more ancient civilization? Adams goes in search of the most alluring of them all – Alexandria on the Oxus. On patrol with the German army David moves over the very same ground as Alexander.

Crossing into Afghanistan in search of the lost city of Bactra, Adams uses the Ancient Greek accounts as a guide to try and locate Alexander’s fabled Central Asian Capital. Long thought to be the citadel of Balkh, the Greeks accounts appear to describe a different city entirely. In the markets beneath the citadel, he finds evidence to suggest Bactra may lie out towards the Oxus River at the end of a great delta.

In search of the Alexander’s Lost World, Adams follows in the footsteps of the earliest Greek explorers, putting a new theory on Jason and the Argonauts to the test. Are the ancient accounts correct? Were the Caspian and Black seas once joined, actually making it possible for the Argonauts to sail to the East?