Herbert was rarely there less frequently than three times in a week, and he never brought me a single word of intelligence that was at all alarming.

Still, I knew that there was cause for alarm, and I could not get rid of the notion of being watched.

Once received, it is a haunting idea; how many undesigning persons I suspected of watching me, it would be hard to calculate.
In short, I was always full of fears for the rash man who was in hiding.
Herbert had sometimes said to me that he found it pleasant to stand at one of our windows after dark, when the tide was running down, and to think that it was flowing, with everything it bore, towards Clara.

But I thought with dread that it was flowing towards Magwitch, and that any black mark on its surface might be his pursuers, going swiftly, silently, and surely, to take him..