
It's an SF book, you have a small group trying to survive in an alien world at war. The guy who pulls them through is the canny merchant, who marshalls the skills of others and negotiates their salvation.
I think the narrator in the book was the engineer - and so was the author, Poul Anderson.
A book that notably does not belong on this list but I read it because I thought it would be mathy has the title The Man Who Counts which I completely misinterpreted and continued to be befuddled by even after I finished reading it, having spent the entire book waiting for the math part of the story that never came.
