Meet the Williamson sisters, Britain's most treasured World War II veterans. Now in their late nineties, Josephine and Penny are still in great form, always in search of their next "excitement." This time it's a trip to Paris to receive the Legion d'honneur for their part in the liberation of France. But this trip is not what it seems. Scandal and crime have always quietly trailed the Williamson sisters, even in the decades after the war. Now armed with new information about an old adversary, these veterans intend to settle scores, avenge lost friends, and pull off one last, daring heist before the curtain finally comes down on their illustrious careers.