I'm sorry, but I do hate this differentiation between the sexes. 'The modern girl has a thoroughly businesslike attitude to life' That sort of thing. It's not a bit true! Some girls are businesslike and some aren't. Some men are sentimental and muddle-headed, others are clear-headed and logical. There are just different types of brains.
Then there are some minor points that strike me as suggestive - for instance, the position of Mrs. Hubbard's sponge bag, the name of Mrs. Armstrong's mother, the detective methods of Mr. Hardman, the suggestion of Mr. MacQueen that Ratchett himself destroyed the charred note we found, Princess Dragomiroff's Christian name, and a grease spot on a Hungarian passport.
The man who came into the room did not look as though his name was, or could have ever been, Robinson. It might have been Demetrius, or Isaacstein, or Perenna - though not one or the other in particular. He was not definitely Jewish, nor definitely Greek nor Portugese nor Spanish, nor South American. What did seem highly unlikely was that he was an Englishman called Robinson.