Ava and Beatrice Jump into action when they meet an ally eager to take down a self-proclaimed prophet and his followers; tragedy strikes at the convent. 

A mysterious nun makes contact with the OCS, while Adriel proposes a partnership to the pope; Lilith turns to an unexpected source for help.

After the Order sends out an urgent call, Beatrice and Ava connect with old friends in Madrid and stop by a museum; Jillian investigates an anormaly.

As a plague sweeps the city, Ava uncovers new revelations about Miguel and Adriel's methods; Lilith explores new possibilities.

Seeking Lilith's whereabouts, the sisters and Miguel visit Jillian; an unnerving discovery upsets Camila; conflict erupts over Adriel at a conclave. 

The Order and their allies prepare for a showdown against Adriel at his new cathedral but learn their adversaries have been making plans of their own. 

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.

Ava visits the other realm and returns with a new plan to end Adriel's unholy charade, but it will require superhuman strength and painful sacrifices.