When a doctor is found brutally murdered in the lurid section of London aptly named -Devils Acre, - even its most hardened residents are stunned. But shock soon turns to horror when Inspector Thomas Pitt discovers three more bodies with the same gruesome -calling card- a stab wound in the back and a rather inexpertly executed mutilation. As Pitt and his wife, Charlotte, race against time to find the killer, a treacherous mystery unfolds. And no one, not the lowest brand of ruffian or the most established aristocrat, will escape unscathed.