This book is about submarine warfare but not from the German perspective.... which is why I didn't post it here:
http://simhq.com/forum/ubbthreads.ph...ubmarine_reads
Written by Bob Whinney;published by Cassell (first published 1986); ISBN no. 0-304-35132-6; this small paperback reprint 2000
The memoir of a Royal Navy Destroyer captain in WW2... I only found it today so I can't give a view yet