His only desire was to think, plan, decide upon some future course of action.

With mind busy, forgetful of the very presence of his companion, he indulged in a bath, again dressed himself, and, lighting a cigar, settled back into an easy chair to fight the whole out alone with himself.
The adventures of the night had greatly changed his conception of this affair in which he had become so strangely involved.

The mystery confronting him appeared more difficult of solution than ever.

His first vague theory of the case had already gone completely to smash.

Question after question rose before him which remained unanswered.