When convoy ONS.5 enters the most perilous part of its journey, an area of the Atlantic that could not be reached by conventional air cover, Dönitz unleashes his wolf-packs.
The U-boats launch attack after attack, while the escort ships must channel the tactics devised by WATU and deliver the Allies a much-needed victory. As the Battle of the Atlantic reaches a crucial turning-point, the work of the Wrens is far from over. Determined to stall an Allied invasion of Nazi Europe, Dönitz has one last ace up his sleeve – a weapon so advanced, which no longer targets the merchant ships, but goes straight for the escorts. To deliver the Allies their victory, Roberts and Laidlaw must do everything in their power to counteract the new German torpedo and recapture the waves for the impending Allied landings in Normandy.
