"Yes," said Patrice, "only one passenger."
They put down their binoculars and one of them said:
"Only one has got away: Vorski evidently. He must have killed Otto, his accomplice."
"Unless Otto, his accomplice, has killed him," chuckled Don Luis.
"What makes you say that?"
"Why, remember the prophecy made to Vorski in his youth: 'Your wife will die on the cross and you will be killed by a friend.'"
"I doubt if a prediction is enough."
"I have other proofs, though."
"What proofs?"
"They, my friends, form part of the last problem we shall have to elucidate together. For instance, what is your idea of the manner in which I substituted Elfride Vorski for Madame d'Hergemont?"