ehind there；〃 demurred Van Aldin。
〃Ah！ I am ing to that。 We have Mrs Kettering's own evidence there； but； on the other hand； we have not really got her evidence； because； Monsieur Van Aldin； a dead woman cannot give evidence。 It is not her evidence； but the evidence of the conductor of the train … a very different affair altogether。〃
〃So you think the man was lying？〃
〃No； no； not at all。 He spoke what he thought to be the truth。 But the woman who told him that she had left her maid in Paris was not Mrs Kettering。〃
Van Aldin stared at him。
〃Monsieur Van Aldin； Ruth Kettering was dead before the train arrived at the Gare de Lyon。 It was Ada Mason； dressed in her mistress's very distinctive clothing； who purchased a dinner basket and who made that very necessary statement to the conductor。〃
〃Impossible！〃
〃No； no； Monsieur Van Aldin； not impossible。 Les femmes； they look so much alike nowadays that one identifies them more by their clothing than by their faces。 Ada Mason was the same height as your daughter。 Dressed in that very sumptuous fur coat and the little red lacquer hat jammed down over her eyes； with just a bunch of auburn curls showing over each ear； it was no wonder that the conductor was deceived。 He had not previously spoken to Mrs Kettering； you remember。 True； he had seen the maid just for a moment when she handed him the tickets； but his impression had been merely that of a gaunt； black…clad female。 If he had been an unusually intelligent man； he might have gone so far as to say that mistress and maid were not unlike； but it is extremely unlikely that he would even think that。 And remember； Ada Mason； or Kitty Kidd； was an actress； able to change her appearance and tone of voice at a moment's notice。 No； no； t