Much of the plot of Treason’s Harbour depends on intelligence and counter-intelligence, a field in which Aubrey’s friend Stephen Maturin excels. Through him we get a clearer insight into the life and habits of the sea officers of Nelson’s time than we would ever obtain seeing things through their own eyes. There is plenty of action and excitement in this novel, but it is the atmosphere of a Malta crowded with senior officers waiting for news of what the French are up to, and wondering whether the war will end before their turn comes for prize money and for fame, that is here so freshly and vividly conveyed.