Bound by Hatred by Cora Reilly

An Enemies-To-Lovers Romance
When Gianna watches her older sister being forced into an arranged marriage, she promises herself to escape a similar fate.

The moment Matteo – The Blade – Vitiello sees Gianna on his brother’s wedding, he wants to possess her. Her father agrees to the bond, but Gianna has no intention of marrying for any other reason than love. A few months before the wedding, Gianna runs away and begins a new life in Europe away from the mafia. But one of their best hunters and assassins is after her: Matteo.

When Matteo and a couple of her father’s soldiers catch her, not only her freedom is at risk, but also the life of the people with her.

Gianna is taken home and forced to marry Matteo.
Ridden by guilt over having dragged innocent people into her world and overcome with hatred toward Matteo, Gianna is determined to make life hell for her husband. But Matteo is a master at mind games and their struggle for power soon turns into hate-fueled nights of passion.