Book six in the Inspector Lestrade series. The London Underground Railway, in 1895, was described as ‘dark, deadly and halfway to Hell’. Only too true, for as the last train rattled into Liverpool Street, the one remaining passenger did not get off. How could she, when her eyes stared sightless and her heart had stopped? There was another corpse at the Elephant in the morn-ing, wedged between the seats like an old suitcase. And another had missed the late-night connection at Stockwell. What was left of her lay on the floor of the ‘padded cell’, her shoes kicked off in the lashings of her agony as she died. There is a maniac at large and Inspector Lestrade is detailed to work with the Railway Police, something he needs a little less than vivisection. Heedless of warnings to ‘mind the gap’ and ‘mind the doors’, the doughty detective plunges through a tangled web of vicious deviants to solve a string of murders so heinous that every woman in London goes in fear of her life. Who is the legendary Blackfriars Dan? What are the secrets of the Seven Sisters? Whose body lies at Ealing? Will the London Transport System survive, or will Lestrade run out of steam?