The population of Gwynedd includes both humans and Deryni, a race of people with inherent psychic and magical abilities who have been persecuted, oppressed and suppressed for two centuries.

The novel begins almost three years after the conclusion of The Quest for Saint Camber, as King Kelson Haldane prepares to make a dangerous journey into the heart of the neighboring kingdom of Torenth.

While attempting to survive a web of deceit and betrayal at a foreign court, Kelson must secure his own throne by finally choosing a royal bride.

The royal party stops briefly in Coroth, where Morgan's wife, Duchess Richenda, urges Kelson to abandon his pursuit of Rothana.

The next day, the royal party progresses to the court of the Hort of Orsal, where both Kelson and Liam are attacked by a pair of mind-altered assassins.

As the royal party continues toward the Torenthi capital of Beldour, Liam confesses to Kelson that he is worried about the loyalty of his uncles Mahael and Teymuraz, though he is trusts Mátyás completely.

For the next several days, Kelson practices the ritual with the assistance of Prince Azim, a relative of Rothana's and a member of the Camberian Council.

That night, Morag captures Earl Sean O'Flynn of Derry and activates a latent magical link in his mind, allowing her to view his thoughts and experiences.

Although initially reluctant to approve the marriage, Noelie's parents agree after Kelson follows Araxie's suggestion and grants them the Duchy of Laas.

Shortly thereafter, Kelson establishes a new home for the Servants of Saint Camber in Rhemuth, and Araxie proves to be instrumental in healing old wounds within the royal family.

In 2001, King Kelson's Bride was ranked 19th in an annual poll of fantasy novels by Locus magazine readers, placing it in a tie with P. D. Cacek's Canyons.