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 and Duncan are in a race against time to get back to the Otherworld. The sword in the stone awaits, and he who pulls the sword from the stone becomes King.