A secret older than the war
When the King of England sends two noble brothers behind the Sultan's lines to fetch a thing he will not name, they stumble onto a truth older than the war they are fighting — and one of them loses his heart to the daughter of the man they were sent to defeat.
On the surface it is the oldest, most irresistible story there is: a Christian knight and a Saracen princess who must not love each other, and do anyway. Underneath runs a second engine. Long before there was a Christendom or a Caliphate, an order called the Vigil kept a small banked flame — the Ember — and the memory of a Lady whose name an older priesthood tried to cut out of the world. The order was shattered; its keepers scattered west and east into the very peoples this war has made enemies.
So the forbidden love is, secretly, a reunion. The two sides were never the strangers they believe themselves to be. And the Ember has one rule and only one: it cannot be wielded in hatred. In a fist closed around a grudge it is a cold, dead stone. Only an open hand can wake it — and only at a price.
Some truths are forbidden because they would end the war.