Kevin Keegan owned the 1970s. We had never seen his like before. There appeared to be nothing he could fail at. Tracking his career from youth-team player at Scunthorpe to the England manager’s job, by way of Liverpool, Newcastle and Hamburg, ‘Keegan’ considers the extravagant highs of a football man who touched the game with genius, who was never sacked and who came within an ace of triumph as a manager. A story of almost and maybe, of excellence and of failure, it is a story too, perhaps, of the fans’ quixotic search for a messiah.