Hoping to find some answers, Ava puts her faith in science. Meanwhile, Cardinal Duretti's machinations sow seeds of dissension inside the Order.

Seeking Lilith's whereabouts, the sisters and Miguel visit Jillian. An unnerving discovery upsets Camila. Conflict erupts over Adriel at the conclave.

After an intense battle, Ava's halo saves a life, while one of Adriel's followers has a crisis of faith. Camila finds herself behind enemy lines.