Malik Bendjelloul’s strikingly assured debut Searching for Sugar Man (2012) is a fascinating documentary founded on the remarkable true story of a seemingly unsuccessful musician who unknowingly – to both himself and his producers – became a national sensation on the other side of the world. It’s a story so unbelievable that it remains a conundrum as to why this extravagant rags to riches tale has until now survived undocumented.