The Thespian Spy by Cheri Champagne

Sprung from the modest roots of a crofter’s life, Miss Mary Wright dreamt of being an actress on stage at the Theatre Royale in London. When a mysterious man in black offers her the life she’s always wanted, how could she possibly refuse? But there is one stipulation: she must become a spy.

Gabriel Ashley, half Scotsman, half Englishman, and Mary’s former best friend, is no longer accepted by his family after the death of his parents. In the darkness of night, a man offers Gabe the opportunity for a very unique and utterly enticing education.
Now, living the life of Crown spies, Mary and Gabe struggle with past differences and old desires. When their superior sends them on an assignment together, will their quarrels tear them apart, or will their magnetic attraction bring them together at long last?