Book 1: INSTRUMENTS OF DARKNESSIn the year 1780, Harriet Westerman, the unconventional mistress of a country house in Sussex, finds a dead man on her grounds with a ring bearing the crest of the nearby Thornleigh Hall in his pocket. With the help of a reclusive local anatomist, Gabriel Crowther, Harriet resolves to find the murderer.Book 2: ANATOMY OF MURDERLondon, 1781. Harriet Westerman anxiously awaits news of her husband, a ship's captain who has been gravely injured in the king's naval battles with France. As London's streets seethe with rumour, a body is dragged from the murky waters of the Thames.Book 3: ISLAND OF BONESCumbria, 1783. The tomb of the first Earl of Greta should have lain undisturbed on its island of bones for three hundred years.When idle curiosity opens the stone lid, however, inside is one body too many.