The Good Knight

When a king is murdered on the way to his wedding, Gareth & Gwen join forces in their first mystery together!

Five years after Gareth walked away from Gwen in disgrace, she encounters him in the aftermath of an ambush, standing over the body of a murdered king. Although it isn't exactly the reunion Gwen had dreamed of, she and Gareth unite against the treachery and intrigue rife within the court of Gwynedd.
And once blame for the murder falls on Gareth himself, Gwen must continue her search for the truth alone, finding unlikely allies in foreign lands, and ultimately uncovering a conspiracy that will shake the foundations of Wales.

Complete Series reading order: The Good Knight, The Uninvited Guest, The Fourth Horseman, The Fallen Princess, The Unlikely Spy, The Lost Brother, The Renegade Merchant, The Unexpected Ally, The Worthy Soldier, The Favored Son, The Viking Prince, The Irish Bride, The Prince's Man, The Faithless Fool, The Honorable Traitor, The Admirable Physician, The Shattered King. Also The Bard's Daughter (prequel novella).