The Engineer Check it out

I thought it would be a shoot and bang boys book but I loved the childhood part and Mrs.Simpson. I found the book to be a tear jerker and something I wanted to finish. It is a complex espionage read and keeps the brain working like Alan Furst. I want to read the next book as there are unanswered questions.What did I learn? The nobility of the Polish Forces in WW2 and my view never to trust