“Or he might have come on to Nice,” suggested Poirot.

“He might,” agreed the Commissary, “but that would be a very bold course.”

Poirot let a minute or two go by before speaking, and then he said:

“In the latter case you think the man was an ordinary train robber?”

The Commissary shrugged his shoulders.

“It depends. We must get hold of the maid. It is possible that she has the red morocco case with her. If so, then the man of whom she spoke to Mademoiselle may be concerned in the case, and the affair is a crime of passion. I myself think the solution of a train robber is the more probable. These bandits have become very bold of late.”

Poirot looked suddenly across at Katherine.