Philby, Greene, and Our Man in Havana.

Ad for Our Man in Havana
(dir. Carol Reed, 1959)

Over at Lapham's Quarterly, Lawrence Osborne discusses the genesis of Graham Greene's Our Man in Havana, including Greene's time in MI6 and his relationship with Kim Philby of the Cambridge spy ring. There's a reference to Greene traveling with "an equally youthful Claud Cockburn"—that's the lefty father of mystery author Sarah Caudwell.