He dined at a lobster palace that night and wore evening clothes.

He went directly to the Cameron building from the restaurant, using a taxicab and speaking both French and Spanish, as well as English, to the driver.

He is a good dresser, and ordinarily a discreet man, yet he left a schedule of firearms in the Cameron suite when he left.

He should have taken that with him." Frank eyed his companion curiously, his face eager in the moonlight, his right hand rubbing his forehead, as if trying to scour away the cobwebs.
"Quit your kidding," he said.
"It is only a question of observation and inquiry," laughed Nestor.
"There is no Sherlock Holmes business about it." "And you think this man in evening dress will come down here and mix with these ragged bums ?" "I think he will come down here," was the reply.
Frank watched the small camp-fire below, just touching with red light the tents Nestor had so successfully entered a short time before.

The logic of the case seemed to be sound enough.