Lord Sunday (The Keys to the Kingdom)

In this final, high-stakes chapter of the series, the mystical House that anchors reality is completely fracturing. If it collapses, the entire universe will cease to exist. The young protagonist, Arthur Penhaligon, alongside his close allies Leaf and Suzy, finds himself separated amid the chaos but unified in a desperate struggle to save creation. Arthur must confront the seventh and final Trustee—the enigmatic and deceptively powerful Lord Sunday. Armed with unique, terrifying magic and deeply buried secrets, Lord Sunday presents the ultimate threat, forcing Arthur to utilize every bit of his resourcefulness and magical power to survive the final hour.