When a student bearing a striking resemblance to artists' renderings of Jesus Christ is found murdered -- by crucifixion -- in London's Jewish ghetto, 19th-century private detective Barker must hire an assistant to help him solve the sinister case. Out of all who answer an ad for a position with "some danger involved," the eccentric and enigmatic Barker chooses downtrodden Llewelyn, a gutsy young man whose murky past includes recent stints at both an Oxford college and an Oxford prison. As Llewelyn learns the ropes of his position, he is drawn deeper and deeper into Barker's peculiar world of vigilante detective work, as well as the dark heart of London's teeming underworld. Together they pass through chophouses, stables, and clandestine tea rooms, tangling with the early Italian mafia, a mad professor of eugenics, and other shadowy figures, inching ever closer to the shocking truth behind the murder.

    . . First-year detective Kathleen Doyle and Chief Inspector Michael Sinclair, Lord Acton, are a most unlikely pair. An Irish redhead of humble beginnings and modest means, Doyle is the antithesis of Acton, the British lord who has established himself as a brilliant but enigmatic figure with a knack for solving London's most high profile homicides. But Acton senses something exceptional beneath Doyle's awkward naivete and taps her to help him with his investigations. And her spot-on intuition is just what he needs to solve a chilling string of murders. . .When a horse trainer is found dead at a racetrack, Doyle and Acton begin interviewing witnesses and the victim's associates, but the killer continues to strike and they're left with more questions than answers. Their investigation is further muddled by their colleagues at CID Headquarters, whose career-driven jealousies and workplace blunders could jeopardize the case--and their nosing into the nature of Doyle and Acton's after hours relationship could lay bare the most classified information of all. . .Perhaps the trainer was the target of a jilted lover on a killing spree. Or maybe the victims were collateral damage in a political coup gone awry. As the murders pile up, Doyle and Acton uncover something far more sadistic than they could have imagined, and now that they know too much, they'll find themselves squarely in the crosshairs of a cold-blooded killer. . .