DEFIANT MISTRESS, RUTHLESS MILLIONAIRE: Mills&Boon comics

Callie was abandoned by her parents at a young age. Fortunately, she was taken in by a wealthy family who owned a large business. Now she works for their company as a secretary. But it seems that someone in the company has been leaking information to a rival business. It took some persuading, but Callie finally agreed to spy on the competition in return. However, she runs into an immediate roadblock when she realizes Josh Tremont, the owner, is far more handsome and charming than she expected…