In A Splinter of Ice, as the cold war begins to thaw, an extraordinary reunion takes place between one of the great novelists of the twentieth century Graham Greene, and his old MI6 boss, the notorious Soviet double agent, Kim Philby. In 1987, the pair met for the first time in 30 years, by which time Philby’s defection had captured the British imagination and contributed to a significant restructure of the secret service. Did Philby regret his actions, and would he ever be tempted to back to the UK? What did those closest to him believe? Greene asks the questions as he delves into the reasons behind Philby’s great betrayal.