The opening quote by Miles about Piotr[]
is from The Mountains of Mourning, judging from an online search (and corroborating memory); will have a look at our library copy (of its reprint in Borders of Infinity), for more exact sourcing. Eschiss1 (talk) 00:57, January 26, 2013 (UTC)
That is correct. It's from near the end, when Miles is talking to fill time about his grandfather; he knows the murderer is the grandmother, and part of how he knows is that he knows that his grandfather was similar in some ways.
(I was the person who put that quote in, by the way)