From the back cover:

The final volume in the Barbarossa trilogy, this title completes the account of the strategic intricacies of the German campaign against Russia. Detailing the final Nazi push for Moscow, Robert Kirchubel examines the causes behind the German failure, including the inability to re-supply troops or provide reserves, and the lack of decent German winter uniforms and transport.

Full-color artwork, maps and bird's-eye views illustrate the campaign in detail, revealing how the Red Army capitalized on every German weakness in spite of its own flaws.