Adenauer by Charles Williams.
This is one of the best biographies I've gotten into in a long time. I started in the middle of the book, just before the Second World War, and planned to read onwards from there, thinking the second half of the book would be the most interesting. But strangely, each chapter I've read has made me want to read the chapter before it...so effectively, I've started at the middle of the book and am now working my way towards the beginning!