A leak is traced to a small sub-section of SIS, sparking off the inevitable security checks, tensions and suspicions. The sort of atmosphere where mistakes could be made? For Maurice Castle it is the end of the line anyway and time for him to retire with his African wife, Sarah.The Human Factor is Greene’s most extensive attempt to incorporate into fiction what he had learned of espionage when recruited by MI6 during World War II . . . What it offers is a veteran excursion into Greene’s imaginative world . . . Sometimes seen as a brooding prober into the dark recesses of the soul where sins and scruples alike fester, he is equally at home in sending a narrative careering along at break-neck pace . . . Raising the demarcation line between ‘serious’ fiction and fast-plotted entertainment, Greene ensures that components of both jostle energizingly together in his pages.” –from the Introduction by Peter Kemp --