Lady Olivia is not all she seems. Trained for marriage to an assigned political target, her skills lie in programming household steambots to serve tea, dress her hair . . . and sound the alarm while she picks locks and listens at doors. Humiliated by a failed assignment, she decides to redeem herself by tailing a suspected double agent. Lord Rathsburn must flirt with treason. Struggles to cure a horrible disease have met with unexpected complications. The cells he engineered can make a man's bones unbreakable, but the side effects are fatal. He believed the research terminated . . . until his sister was kidnapped by a German count. Her ransom? A cure. Piloting a stolen dirigible, he uncovers an unlikely stowaway, Lady Olivia. Arriving together at a crumbling castle, an impossible task is set before them: cure the count's guardsmen. Amidst their fake marriage, a very real growing attraction, dying guardsmen, and escalating hostilities, Lady Olivia and Lord Rathsburn are thrust deep into the world of international medical espionage from which there may be no return.