'Spies should be glamorous - James Bond in a Savile Row suit rather than Harry Palmer in a grubby mac . . . In those terms, Otto Katz was perfect. He was a Hollywood playboy who hobnobbed with Fritz Lang, he inspired the character of Victor Laszlo in Casablanca, he was a drinking buddy of Bertolt Brecht and among his lovers he claimed Marlene Dietrich. He was even known to N el Coward' The Times