Hercule Poirot nodded understandingly. It seemed to him appropriate that Miss Lemon's sister should have spent most of her life in Singapore. That was what places like Singapore were for. The sisters of women like Miss Lemon married men in business in Singapore, so that the Miss Lemons of this world could devote themselves with machine-like efficiency to their employers' affairs (and of course to the invention of filing systems in their moments of relaxation).