Just finished this short book. A German military historian wrote the book in German; this is an English translation. The book gives a high level discussion of the war in the east, not just 1941. Interestingly, the author points out some weaknesses of the Wehrmacht that contributed to losing the war.
Currently reading "Rising Sun" by John Toland. I started in the middle and am now reading the section concerning the internal Japanese discussions with regard to surrender. The internal chaos was even worst than I thought.