
The untold story of the members of the Women's Royal Naval Service, whose brilliant tactics defeat a massive convoy of German U boats in WWII.

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After ONS.5, Roberts and Laidlaw must do everything in their power to counteract Dönitz's acoustic torpedo and recapture the waves before the impending D-Day landings.

In 1943, pressure mounts on WATU to prove their value; when convoy ONS.5 catches Dönitz's attention, the stage is set for the battle that will turn the tide of the Atlantic war.

Roberts and Laidlaw uncovered a flaw in the Royal Navy's anti-U-boat tactic "Buttercup"; they must convince Noble that their new maneuver will sink Dönitz's U-boats.

Gilbert Roberts sets up a tactical school to counter the U-boats; he enlists the help of Jean Laidlaw and a small team of Wrens to war-game battles and develop new maneuvers.