Rogue Defender by Patricia D. Eddy

Leo:
I spent half of my CIA career at the bottom of the bottle, and still managed to do my job. But seeing one of my only friends tortured within an inch of his life is a great motivator to get clean—and retire somewhere no one actively wants to kill me.
I’m almost happy in Panama. Until someone breaks in to my neighbor’s apartment and I come to her rescue.
Suddenly, my solitary existence isn’t enough. I want more. But before I can decide if a broken loner like me is worthy of love, danger we never expected threatens everything.

Domina:
I worked my way into the upper ranks of the Panamanian government. One of the few women to ever be invited to the inner circle. But when secrets turn into lies and lies turn deadly, my only hope is a man who hates himself as much as he hates the people putting me in danger.
I can’t trust him. Not with his past—and mine. But Leo is my only hope, And maybe…he holds the key to my heart as well.

Rogue Defender is the fourth book in the Gone Rogue series. It can be read as a complete standalone, but does feature characters from previous Gone Rogue and Away From Keyboard series books.