"In the first place, Lupin calls himself Monsieur R-------."

"Rather vague information," she replied.

"Secondly, he is traveling alone."

"Does that help you?" she asked.

"Thirdly, he is blonde."

"Well?"

"Then we have only to peruse the passenger-list, and proceed by
process of elimination."

I had that list in my pocket. I took it out and glanced through
it. Then I remarked:

"I find that there are only thirteen men on the passenger-list
whose names begin with the letter R."

"Only thirteen?"

"Yes, in the first cabin. And of those thirteen, I find that nine
of them are accompanied by women, children or servants. That
leaves only four who are traveling alone. First, the Marquis de
Raverdan----"

"Secretary to the American Ambassador," interrupted Miss Nelly.
"I know him."