Mysterious Ways — Julia Talbot

What begins as a purely academic study of a bland medieval portrait soon turns Father Jacob Ellory's life upside down. The young priest soon becomes enmeshed in the affairs and intrigues of the Rossi family, finding himself caught up in a gilded world of art, mystery, and sin. Soon Jacob is in over his head, unable to tell who is a friend or an enemy, and terrified that he is losing his mind.

From the machinations of the Catholic church, to the seductive power of a beautiful set of twins, join Jacob on his exploration of a whole new world, where he learns there is much more to life than serving God.

(Relations between twins and religious themes.)