125 Gower Street, 1882.

Sidney Grice once had a reputation as London's most perspicacious personal detective. But since his last case led an innocent man to the gallows, business has been light. Listless and depressed, Grice has taken to lying in the bath for hours, emerging in the evenings for a little dry toast and a lot of tea. Usually a voracious reader, he will pick up neither book nor newspaper. He has not even gathered the strength to re-insert his glass eye. His ward, March Middleton, has been left to dine alone.

Then an eccentric member of a Final Death Society has the temerity to die on his study floor. Finally, Sidney and March have an investigation to mount — an investigation that will draw them to an eerie house in Kew, and the mysterious Baroness Foskett...