The Nile's source was the last great mystery for European explorers in the 19th century. The story of its discovery is one of heroism in the service of faith, greed, and obsession. Exceptional cinematography of harsh and unforgiving African landscapes, remarkable sequences of mass camel treks and perilous river crossings, the series was highly acclaimed at the time and commands strong online interest to this day. In the middle of the 19th Century, at the height of Britain’s imperial power, an unsolved mystery lay in the very heart of Africa, the mystery of the source of the Nile. It was a challenge that attracted a handful of extraordinary men: a challenge strong enough to reveal the best, and the worst, in all of them.