The Fourth Horseman — Sarah Woodbury

May 1144. Newly wedded, Gareth and Gwen travel across the border into England on a diplomatic mission with Prince Hywel of Wales. Within moments of their arrival, however, the mission goes awry and a murder case drops (literally) at their feet.

Hindered at every turn by a climate of civil war and constantly shifting political alliances, Gareth and Gwen race to solve the murder and expose a plot that threatens not only their lives, but the life of the future King of England himself.

Murder, intrigue, and treachery take center stage in The Fourth Horseman, the third Gareth & Gwen medieval mystery.

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
Also The Bard's Daughter (prequel novella).