Clavipes

Having resigned his position at Bow Street in disgrace (at least in his own mind) and failed in his attempt to establish himself as a private agent, John Pickett toils away at a tedious job as a clerk in the city. When he is approached by a man wishing to hire him to extract a young lady being held against her will at an asylum for opium-eaters, Pickett jumps at the chance to prove himself, and has a very reluctant Julia commit him to the institution as a patient. But nothing at the Larches is exactly as it seems.

It's 1811, and the threat of revolution haunts the upper classes of King George III's England. Then a beautiful young woman is found savagely murdered on the altar steps of an ancient church near Westminster Abbey. A dueling pistol found at the scene and the damning testimony of a witness both point to one man - Sebastian St. Cyr, Viscount Devlin, a brilliant young nobleman shattered by his experience in the Napoleonic Wars.