When Merlin goes missing and Camelot falls under attack, King Arthur sends his estranged half-sister, Morgan le Fay, and esteemed Knights of the Round Table, Tristan and Lancelot, to find him. As the reluctant trio travels through Albion saving towns from treacherous foes and battling fae, their bonds deepen, and sparks fly between the two knights. Before they can sort through their complicated feelings, an unexpected dark force appears, bringing what just might be the end of Camelot.