When a group of Nationalists use an ancient artifact to bring a villain from Arthurian myth back from the dead to gain power, ex-monster hunter Bridgette McGuire escapes her retirement home and pulls her unsuspecting grandson Duncan, a museum curator, into a world of magic and mysticism to defeat a legendary threat.
Gran, Duncan and Rose are on a new quest to learn more about Merlin’s plan when they come face-to-face with another mysterious knight of legend. But if they want to track down the powerful Nimue and stay one step ahead of their enemy, it seems the trio will need to play this knight’s game, whether they like it or not...