On a winter’s evening, a trio of unruly teenagers board a bus, ganging up on Luke Murray, threatening to kill him. No one intervenes until Jason Barnes, a young student, challenges the gang. Luke seizes the chance to run off the bus, but he’s followed. Andrew Barnes is dragged from the shower by his wife Valerie: there’s a fight in the garden and Jason’s trying to break it up. As Andrew rushes to help, the gang flees.
In the year 1780, Harriet Westerman, the willful mistress of a country manor in Sussex, finds a dead man on her grounds with a ring bearing the crest of Thornleigh Hall in his pocket. Not one to be bound by convention or to shy away from adventure, she recruits a reclusive local anatomist named Gabriel Crowther to help her find the murderer, and historical suspense's newest investigative duo is born.