When the eccentric and enigmatic Cyrus Barker takes on the recent murder case of a young scholar in London's Jewish ghetto, he realizes that he must hire an assistant, and out of all who answer an ad for a position with "some danger involved," he chooses downtrodden Llewelyn, a gutsy young man with a murky past. As they inch ever closer to the shocking truth behind the murder, Llewelyn is drawn deeper and deeper into Barker's peculiar world of vigilante detective work, as well as the heart of London's teeming underworld. Brimming with wit and unforgettable characters and steeped in authentic period detail, is a captivating page-turner that introduces an equally captivating duo.