6 THE EVIDENCE OF THE RUSSIAN PRINCESS
“Let us hear what Pierre Michel has to say about this button,” he said.
The Wagon¹ Lit conductor was recalled. He looked at them inquiringly.
M. Bouc cleared his throat.
“Michel,” he said, “here is a button from your tunic². It was found in the American lady’s compartment³. What have you to say for yourself about it?”
The conductor’s hand went automatically to his tunic. “I have lost no button, Monsieur,” he said. “There must be some mistake.”
“That is very odd.”
“I cannot account for it, Monsieur.” The man seemed astonished, but not in any way guilty or confused.
M. Bouc said meaningly: “Owing to the circumstances in which it was found, it seems fairly certain that this button was dropped by the man who was in Mrs. Hubbard’s compartment last night when she rang the bell.”
“But, Monsieur, there was no one there. The lady must have imagined it.”
“She did not imagine it, Michel. The assassin of M. Ratchett passed that way—and dropped that button.”
As the significance of M. Bouc’s words became plain to him, Pierre Michel flew into a violent state of agitation⁴.
“It is not true, Monsieur; it is not true!” he cried. “You are accusing me of the crime. Me, I am innocent. I am absolutely innocent! Why should I want to kill a Monsieur whom I have never seen before?”
“Where were you when Mrs. Hubbard’s bell rang?”
“I told you, Monsieur, in the next coach talking to my colleague.”
“We will send for him.”
“Do so, Monsieur, I implore⁵ you, do so.”
The conductor of the next coach was summoned. He immediately confirmed Pierre Michel’s statement. He added that the conductor from the Bucharest coach had also been there. The three of them had been discussing the situation caused by the snow. They had been talking some ten minutes when Michel fancied he heard a bell. As he opened the doors connecting the two coaches, they had all heard it plainly—a bell ringing repeatedly. Michel had run post-haste to answer it.

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