U-Boat Wargamers

The Mastermind: World War II breaks out and a force of U-boats attempt to starve Britain into submission. Meanwhile, Vera Laughton Mathews recruits talented women into the Wrens.

The Wrens: Though the Admiralty are convinced the Allies have the expertise to defeat Germany, Roberts and the Wrens start devising wargaming tactics to combat U-boat formations.

Stalemate: With the Allies at crisis point, pressure mounts on the Wrens to prove their worth and the stage is set for a battle that will turn the tide of the Atlantic war.