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.
Bridgette and Duncan return to a familiar place to pick up Lancelot’s trail, while Rose comes face to face with another member of the McGuire family she was not expecting to see...