Arriving in Paris to receive the Légion d'honneur for their part in the liberation of France, the 90-something Williamson sisters, Britain's most treasured World War II veterans, use this opportunity to settle scores, avenge lost friends and pull off one last, daring heist before their illustrious careers are over.

"You're never too old for adventure. When you're a geriatric armed with nothing but gumption and knitting needles, stopping a sorcerer from wiping out an entire dragon-fighting organization is a tall order. No one understands why 83-year-old Edna Fisher is the Chosen One, destined to save the Knights from a dragon-riding sorcerer bent on their destruction. After all, Edna has never handled a magical weapon, faced down a dragon, or cast a spell. And...