In 'One-Man Band', the third volume in his epic survey of Orson Welles' life and work, Simon Callow again probes in comprehensive and penetrating detail into one of the most complex artists of the 20th century, looking closely at the triumphs and failures of an ambitious one-man assault on one medium after another - theatre, radio, film, television - even, at one point, ballet - in each of which his radical and original approach opened up new directions and hitherto unglimpsed possibilities.