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This is the Scottish author of naval detectives, the paradoxical and sharp-tongued Alistair Maclean. And this is his most famous action film about the superagent Calvert. Given that this novel was once made into a film starring Anthony Hopkins, Calvert was for a while a rival to James Bond. But he was too realistic, because Maclean himself had been a naval torpedo man during the war, and he was ashamed to fantasise about cars, gadgets and beauties in front of his naval comrades as ungodly as Bond's "dad" Ian Fleming did. Although there are beauties, secret weapons, boats, scuba gear, a detective story and the salvation of the British Empire. But almost all the beauties stay alive because Maclean is kind, and his hero is undoubtedly a knight of goodness.