Though it isn't solely focused on Barbarossa, I thought Bloodlands by Timothy Snyder was great.
It is half way (Chapt.5) into the book before the invasion. Snyder described it as "It was the beginning of a calamity that defies description."
Snyder's "Bloodlands" and then his book " Black Earth" are in my opinion great reads to at least somewhat understand how this "calamity" came about. If unfamiliar they, (particularly Black Earth) provide some insight into Hitler's thinking, and why the ultimate strategic goal (beyond Lebensraum) was the reordering of the world in accordance with Race, which required the extermination of Jews. They also make clear the relationship between the destruction of the State and the ability to operate lawlessly. This destruction of the State is a requirement for total war and genocide. (In Black Earth he emphasizes the "double destruction' by first the Soviet occupation followed then by the Germans)

The next book recommendation take with a grain of salt as I haven't read it. I mention it because:
1. I understand that it would be more about "the eastern front as a whole" than the 2 Snyder books.
2. I understand that the book is primarily from the Soviet perspective. Should be plenty of books out there that have a more Western Allies and German perspective. Supposedly this one emphasizes the Slavs, so a little twist for an English language publication.

"When Titans Clashed: How the Red Army Stopped Hitler"
By David Giantz
and Jonathon House
Published 1995