The Monster of Montvale Hall by Nadine Millard

A childhood tragedy had shaped the life of Robert Forsythe, the Duke of Montvale Hall, forever.
He kept himself isolated from the world and the people in it, reveling in his reputation as a monster.
Locked in a world of guilt and grief, nobody had ever been able to break down the walls he kept around him. Nobody had ever tried.
And if being a monster kept everyone away, then a monster he would be.
Abigail Langton was as headstrong as she was mischievous, so it was no surprise that she wasn’t exactly welcomed at Montvale Hall with open arms.
It didn’t take her long to understand why its owner was called a monster.
It took even less time to realize that monster or not, Abigail’s heart called to him in a way she couldn’t deny or understand.
Robert’s world is turned upside down and inside out by the irrepressible Abigail. And try as he might to avoid it, he finds himself drawn to her in ways he doesn’t want. In ways that scare the wits out of him.
Will Robert give in to the temptation that is Abigail? And will Abigail find the heart of the man beneath the monster?