The war for Sarténe has begun. In the city of Mayence the people prepare defences and wait for the All-Church army to come. Everything depends on Calesh Saissan and his friends, but the invading army is moving quickly, cutting the city off. In the confusion, an assassin has slipped into the city and is waiting for his chance, even as the enemy approaches. Luthien struggles with his conscience, determined to keep his vow of non-violence but torn as he watches his friends face dangers.In the mountains, the Lady of the Hidden House teaches her lore to Farajalla, her chosen heir. Because the ancient arts must survive, or nothing Calesh does will matter. But as the All-Church moves to surround Mayence, it seems nothing of Sarténe will survive at all.