Double Sin: A Hercule Poirot Short Story. Агата Кристи

      ‘Oh, do not excite yourself. Shall I say that he interested me because he was trying to grow a moustache and as yet the result is poor.’ Poirot stroked his own magnificent moustache tenderly. ‘It is an art,’ he murmured, ‘the growing of the moustache! I have sympathy for all who attempt it.’

      It is always difficult with Poirot to know when he is serious and when he is merely amusing himself at one’s expense. I judged it safest to say no more.