Following on from Sea of Wolves, the Wolves in Winter plots the lives of those caught up on both sides. Jürgen Bortfeldt, the music-loving commander of U-133, struggling to control the tensions amongst his divided officers. Jan Pedersen, a member of the Norwegian resistance, fighting the enemy occupying his country in whatever way he can. And Vera Baldwin, the skilled codebreaker at Britain's Bletchley Park and the unseen hand guiding the Protea and her convoys through the dangers crowding around them.
Triumph and tragedy await them all in a battle fought across the roof of the world.