Valkyrie is dying. The drug called Excalibur is slowly killing him, destroying his organs and eating him from the inside out. No one knows if they can stop it, or if there is a cure. Kilia is trying everything she can to keep him alive, but his state is worsening by the day. Jace blames himself for what happened and he's determined to fix it at all costs. Chasing down the rumors of the new drug 'Holy Grail', he'll do what it takes to get the cure and give it to Valkyrie. Even when it means coming face to face with a past he thought got buried under a building several years ago.