The Hallowed Hunt — Lois McMaster Bujold

The half-mad Prince Boleso has been slain by a noblewoman he had intended to defile -- and Lord Ingrey kin Wilfcliff must transport the body to its burial place and the accused killer, the Lady Ijada, to judgment. With the death of the old Hallow King imminent and the crown in play, the road they must travel together is a dangerous one. And though he is duty-bound to deliver his prisoner to an almost certain death, Ijada may be the only one Ingrey dares trust. For a monstrous malevolence holds the haunted lord in its sway -- and a great and terrible destiny has been bestowed upon him by the gods, the damned, and the dead.