Shadowsinger by L.E. Modesitt
The nation of DeFalk lies under peril of invasion. Once more the Sturrinese are gathering their strength in an attempt to crush the peaceful land and enslave its people.Newlywed Secca - Protector of DeFalk - and her sorcerer husband, Alcaren, have come to realise that there can be no truce with the warlike Sturrinese. If peace is to ever come then the power of the Sturrinese lords must be utterly destroyed - and the only way to destroy the Sturrinese is to take the battle to them .But in the war that follows Secca realises that the Sturrinese are merely the servants of a new and far more perilous foe .