Once & Future The king is undead. Volume one

When a group of Nationalists use an ancient artifact to bring a villain from Arthurian myth back from the dead, retired monster hunter Bridgette McGuire pulls her unsuspecting grandson Duncan, a museum curator, into a world of magic and mysticism to defeat a legendary threat. Now the two must navigate the complicated history of the McGuire family, all while combating the deadly secrets of England's past that threaten its very future.