n Proto, acclaimed journalist Laura Spinney sets off to find out. With her we travel the length of the steppe, navigating the Caucasus, the Silk Roads and the Hindu Kush. We follow in the footsteps of nomads and monks, Amazon warriors and lion kings – the ancient peoples who spread these tongues far and wide. In the present, Spinney meets the linguists, archaeologists and geneticists racing to recover this lost world. What they have discovered has vital lessons for our modern age, as people and their languages are on the move again.