If he had one regret now it was that he had not been out with Monmouth.

That, of course, was illogical; but you can hardly expect logic from a man in his position.
His chain companion on that dreadful march was the same Jeremy Pitt who had been the agent of his present misfortunes.

The young shipmaster had remained his close companion after their common arrest.

Hence, fortuitously, had they been chained together in the crowded prison, where they were almost suffocated by the heat and the stench during those days of July, August, and September.
Scraps of news filtered into the gaol from the outside world.

Some may have been deliberately allowed to penetrate.