I really recommend ĎAn Honourable Defeatí by Anton Gill. It analysis the role the German Resistance played, and why it was both largely ineffective and hugely heroic. Gill uses accounts from surviving Resistance members, both interviews and letters and journal entries and such. This book was very illuminating, and offered real insight into this aspect of the war. While the book is absolutely non-fiction Gill has a lively and engaging prose style that makes ĎAn Honourable Defeatí a very easy and enjoyable read. Itís currently free for kindle on amazon, and certainly worth a go.