Infiltrating the Vatican to find a tomb hidden deep underground for a millennium? Hell, Ava may need a miracle to pull off this mission. ...

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

As Ava contemplates starting over, she recalls being left to the tender mercies of the orphanage. The Sister Warriors suit up for a dangerous mission. ...

Ava takes her first steps toward understanding the halo's power, but a baptism by fire at the hands of the Order leaves her feeling burned. ...