This gripping cold-war spy story will keep you reading way past your bedtime - even when I was on the penultimate page, I had not guessed how this brilliantly characterised novel would end. Graham Greene paints a picture of the most confidential 'department of the Foreign Office' (aka 'the firm') as one staffed by emotionally stunted heavy-drinkers who return to their lonely flats with no-one to telephone for a chat. The (anti-)hero of the novel, Maurice Castle, is strikingly contrasted from this grey bureaucratic backdrop from the beginning. The telephone motif weaves its way throughout the novel, becoming an ever-more sinister symbol for deceit, betrayal, and ultimately leading to a chilling denouement.
This novel has more in common with the Melita Norwood school of spying than with James Bond, and is all the more convincing as a result. Just remember to watch for all the clues once you've become engrossed in the plot!