Phantom of the Highlands by Kenna Kendrick

Being a Phantom means that you have no place in the light of day…

Gillian Hamilton was unlucky enough to be born a female. Her sex was a barrier to everything she wanted: freedom, adventure, and the need to be heard. Fascinated by tales of the misty Highlands when the opportunity arises, she flees secretly to Edinburgh.
But the world is much more wicked than Gillian knows, and the noble Highlander she encounters might have ulterior motives.
With his people suffering from poverty and hunger, Col, a fierce Scotsman, decides to defy fate. He turns himself into the Phantom and provides for the Scottish by pillaging the English.
When he meets the most striking lass, he will be immediately charmed by her boldness and beauty.
Until he discovers that her family is responsible for all his life’s tragedies. And so, he captures her without knowing that he is the lesser of the evils after her.
Gillian is not aware that she is in grave danger, and that without Col’s help, nothing can stop her impending death.
He captured her to save his people, but she stole his heart…