1781 The streets of London seethe with rumour and conspiracy as the King’s navy battles the French at sea. And while the banks of the Thames swarm with life, a body is dragged from its murky waters. In another part of town, where the air seems sweeter, the privileged enjoy a brighter world of complacent wealth and intoxicating celebrity. But as society revels in its pleasures, a darker plot is played out.

Yet some are willing to look below the surface to the unsavoury depths. Mrs Harriet Westerman believes passionately in justice. Reclusive anatomist Gabriel Crowther is fascinated by the bones beneath the skin. Invited to seek the true nature of the dead man, they risk censure for an unnatural interest in murder. But when the safety of a nation is at stake, personal reputation must give way to the pursuit of reason and truth.