Sinner by Matilda Martel

He gave his life to God. But he’d burn in hell for her.
Father Nico Moretti took a vow of chastity, obedience, and peace. But nothing prepared him for Caterina Benetti—young, beautiful, and forbidden. The daughter of a powerful mafia don, she’s been promised to another. Desperate for a way out, she confesses her sins to Nico… and awakens a desire he’s spent a lifetime trying to silence.

He wants to save her.
She wants to save herself.
But love like theirs demands blood—and Nico may have to sacrifice everything, even his soul, to keep her safe.

He ran from temptation.
Now he’s running with it.