It is the winter of 1143 and all is not well in the court of Owain, King of North Wales: His future in-laws are untrustworthy; the Norman lords on his eastern border are restless; and among his wedding guests lurks a cold-blooded killer.

Gareth and Gwen have marriage plans of their own, but their love will have to wait while the pair race to separate truth from lies, friends from foes, and unravel the mystery before King Owain - and his new bride - fall victim to their uninvited guest.