A dramatisation of Philip Pullman's second novel about Victorian heroine Sally Lockhart. It's six years since The Ruby in the Smoke, and Sally has her own financial consulting business. When a client loses a fortune following the unexpected collapse of a shipping firm, the young businesswoman grows suspicious and sets out to investigate - and a clairvoyant soon puts her on the trail of the richest man in Europe and a terrifying new weapon, the Hopkinson Self-Regulator.