The Wonder by J.D. Beresford

For many months after that long afternoon in the library, Challis was affected with a fever of restlessness, and his work on the book stood still. He was in Rome during May, and in June he was seized by a sudden whim and went to China by the Trans-Siberian railway. Lewes did not accompany him. Challis preferred, one imagines, to have no intercourse with Lewes while the memory of certain pronouncements was still fresh. He might have been tempted to discuss that interview, and if, as was practically certain, Lewes attempted to pour contempt on the whole affair, Challis might have been drawn into a defence which would have revived many memories he wished to obliterate.

He came back to London in September -- he made the return journey by steamer -- and found his secretary still working at the monograph on the primitive peoples of Melanesia.