The Remarkable Retirement of Edna Fisher

In which a geriatric-turned-Chosen-One sets out to take down a sorcerer killing knights like her long-dead son- until abuse in the ranks makes her question who needs saving.
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 everyone knows the Council of Wizards always chooses a teenager—like the vengeful girl ready to snatch Edna's destiny from under her nose.
Still, Edna leaps at the chance to leave the nursing home. With her son long dead in the Knights' service, she's determined to save dragon-fighters like him and to ensure other mothers don't suffer the same loss she did. But as Edna...