Hetty starts her new life in a grand country house but is immediately drawn into a world of mystery. And a London gang are searching for her, too.

Hetty plans to rescue a kidnapped girl, leading to a final confrontation with her old enemy.

Hetty discovers an explosive secret, while Gideon fears he caused Edwin's life-threatening accident. Fierce Lady Grenford arrives to help Rosamund with the birth of her new baby.