Cryptogram from Frankenstein; or, the modern prometheus, chapter 21

We were not allowed to converse for any length of time, for the precarious state of my health rendered every precaution necessary that could ensure tranquillity. Mr. Kirwin came in and insisted that my strength should not be exhausted by too much exertion. But the appearance of my father was to me like that of my good angel, and I gradually recovered my health.

The sentence you are solving goes here.

The season of the assizes approached. I had already been three months in prison, and although I was still weak and in continual danger of a relapse, I was obliged to travel nearly a hundred miles to the country town where the court was held. Mr. Kirwin charged himself with every care of collecting witnesses and arranging my defence. I was spared the disgrace of appearing publicly as a criminal, as the case was not brought before the court that decides on life and death. The grand jury rejected the bill, on its being proved that I was on the Orkney Islands at the hour the body of my friend was found; and a fortnight after my removal I was liberated from prison.