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.
Surrounded by British government forces, Nimue calls for backup - but will Merlin and Galahad help stop the opposition...or expose Britain to the truth? Meanwhile, Bridgette and Duncan are trapped in the Otherworld and blocking their exit is Arthur’s greatest knight: Lancelot.