High Deryni
Katherine Kurtz
 The novel takes place in June and July 1121, less than a year after the coronation of fourteen-year-old King Kelson Haldane. At the beginning of the book, Kelson is leading an army into the Duchy of Corwyn to put down the rebellion of an anti-Deryni zealot named Warin de Grey. Warin is allied with Archbishop Edmund Loris, the leader of the Holy Church. Together, they have taken the ducal capital of Coroth and are openly revolting against the Crown due to Kelson's support of his Deryni advisors, Duke Alaric Morgan and Monsignor Duncan McLain. Morgan and Duncan decide to go to Dhassa and seek to reconcile with the six bishops who have refused to follow Loris' anti-Deryni crusade. Meanwhile, in the border city of Cardosa, King Wencit Furstán, the powerful Deryni ruler of the neighboring kingdom of Torenth, seeks to convince Earl Bran Coris of Marley to betray Kelson and assist in an invasion of Gwynedd. Morgan and Duncan arrive at Dhassa and surrender to the bishops, who are led by Thomas Cardiel and Denis Arilan. After hearing their explanations for their previous actions, the two bishops agree to forgive them. On the border, Earl Sean Lord Derry, Morgan's aide, is captured by Bran Coris. Coris has decided to betray Kelson and immediately turns Derry over Wencit, who begins to torture Derry both physically and mentally. Morgan senses Derry's pain when he attempts to contact him, but his use of his powers is detected by Bishop Arilan, who reveals that he is also Deryni. Kelson's army then marches to Coroth, where the young king confronts the rebellious archbishop. Unwilling to assault Coroth directly, Morgan sneaks into the castle with Kelson, Duncan, and Bishop Cardiel. Once inside, they confront Warin and force him to re-evaluate his beliefs by comparing his mysterious healing ability to Morgan's. Having acquired Warin's aid, Kelson confronts Loris the following morning and takes the archbishop into custody. With the internal ecclesiastical schism now resolved, Kelson's army prepares to face the invading Torenthi army. Kelson learns of Bran Coris' treason, but is nonetheless determined to win the war. The Gwyneddan army arrives at the border shortly thereafter and is greeted by grisly evidence of Bran Coris' betrayal. During a parley session with the Torenthi invaders, Morgan manages to rescue Derry, but the army is unable to prevent the murder of fifty Gwyneddan soldiers, including Duncan's father. Wencit challenges Kelson to a Duel Arcane, a form of ritualized magical combat in which each king will be accompanied by three companions. Before Kelson can agree, Arilan suddenly requests a brief period to consider the challenge. A short time later, Arilan reveals that he is not only Deryni, but also a member of the Camberian Council, a secretive group of highly-trained Deryni who oversee and regulate such duels. In issuing his challenge, Wencit claims that he has secured the cooperation of the Council, but Arilan has heard nothing of such a request. He establishes a Transfer Portal in Kelson's tent and travels to the Council's chambers, demanding an explanation from his comrades. They soon realize that Wencit has attempted to trick Kelson by bringing four imposters to the duel. Though initially reluctant to arbitrate the duel, the Council finally agrees after Arilan brings Kelson, Morgan, and Duncan to confront them. The following morning, Kelson rides out to face Wencit, accompanied by Morgan, Duncan, and Arilan. Although furious when the real Council arrives, Wencit eventually concedes to their presence. The Duel Arcane begins, but it is suddenly interrupted before the first spell can be summoned. One of Wencit's allies reveals himself to be another member of the Camberian Council, one who has been working to bring down Wencit for years for his own personal reasons. He provided poisoned wine for Wencit and his other allies, and all four are soon dying from its effects. Unwilling to let his enemies suffer needlessly, Kelson uses his powers to kill each of them. With Wencit's death, the Duel Arcane is ended and Kelson emerges victorious.