was concerned in the crime.  That we shall see.  But it is quite clear, I think, that it was not he who opened the house to the murderers, for he was at Chambery in the evening, and the murder was already discovered here by midnight.  Moreover—­it is a small point—­he lives, not in the house, but over the garage in a corner of the garden.  Then besides the chauffeur there was a charwoman, a woman of Aix, who came each morning at seven and left in the evening at seven or eight.  Sometimes she would stay later if the maid was alone in the house, for the maid is nervous.  But she left last night before nine—­there is evidence of that—­and the murder did not take place until afterwards.  That is also a fact, not a conjecture.  We can leave the charwoman, who for the rest has the best of characters, out of our calculations.  There remain then, the maid, Helene Vauquier, and”—­he shrugged his shoulders—­“Mlle. Celie.”

Hanaud reached out for the matches and lit a cigarette.

“Let us take first the maid, Helene Vauquier.  Forty years old, a Normandy peasant woman—­they are not bad people, the Normandy peasants, monsieur—­avaricious, no doubt, but on the whole honest and most respectable.  We know something of Helene Vauquier, monsieur.  See!” and he took up a sheet of paper from the table.  The paper was folded lengthwise, written upon only on the inside.  “I have some details here.  Our police system is, I think, a little more complete than yours in England.  Helene Vauquier has served Mme. Dauvray for seven years.  She has been the confidential friend rather than the maid.  And mark this, M. Wethermill!  During those seven years how many opportunities has she had of conniving at last night’s crime?  She was found chloroformed and bound.  There is no doubt that she was chloroformed.  Upon that point Dr. Peytin is quite, quite certain.  He saw her before she recovered consciousness.  She was violently sick on awakening.  She sank again into unconsciousness.  She is only now in a natural sleep.  Besides those people, there is Mlle. Celie.  Of her, monsieur, nothing is known.  You yourself know nothing of her.  She comes suddenly to Aix as the companion of Mme. Dauvray—­a young and pretty English girl.  How did she become the companion of Mme. Dauvray?”

Wethermill stirred uneasily in his seat.  His face flushed.  To Mr. Ricardo that had been from the beginning the most interesting problem of the case.  Was he to have the answer now?

“I do not know,” answered Wethermill, with some hesitation, and then it seemed that he was at once ashamed of his hesitation.  His accent gathered strength, and in a low but ringing voice, he added:  “But I say this.  You have told me, M. Hanaud, of women who looked innocent and were guilty.  But you know also of women and girls who can live untainted and unspoilt amidst surroundings which are suspicious.”

Hanaud listened, but he neither agreed nor denied.  He took up a second slip of paper.