The Likelihood of Lucy by Jenny Holiday

She would never bow to any man.
Trevor Bailey is on the cusp of opening the greatest hotel in London. His days as a gutter snipe are behind him, as he enjoys a life of wealth, society, and clandestine assignments as a spy in the service of the Crown. Until one tumultuous night churns up the past he’d long left behind…
Turned out by her employer for her radical beliefs, Lucy Greenleaf reaches out to the man who was once her most beloved friend. She never expected that the once-mischievous Trevor would be so handsome and gentleman-like, and neither can deny the instant attraction.
But Lucy’s reformer ways pose a threat to the hotel’s future and his duties as a spy. Now Trevor must choose between his new life and the woman he’s always loved.