Classicly

There were other reasons than that, moreover, for the interest he was taking in this stranger. He regarded the episode quite as seriously as the young Englishman himself. He knew much better than the other what daring and audacious crimes are committed in New York, and he began to suspect that this might be one of them.

Nick had decided to look at least a little deeper into the matter, therefore, and it was with that object in view that he suggested going to the Englishman’s lodging house, which was only a few blocks south of where the two men had met.