Sword and Serpent

"In A.D. 299, the Roman oracles ceased to prophesy for the Emperor Diocletian. The silence of the gods sparks a bloody storm of persecution that sweeps across the Roman Empire. As the fires of suspicion and hatred ignite all around them, a young man and a young woman are united by a mysterious prophecy from the catacombs of Rome ... one that will set them on a journey to battle an evil beyond imagining. Saints aren't born. They are forged."--Publisher's website