From the Number One bestselling author of Behind Her Eyes. Delve into a gaslit London, where Jack the Ripper is making headlines, but another, much more dangerous, madman is on the loose.

When a rotting torso is discovered in the vault of New Scotland Yard, it doesn't take Dr Thomas Bond, Police Surgeon, long to realise that there is a second killer at work in the city where, only a few days before, Jack the Ripper brutally murdered two women in one night.

This is the hand of a colder killer, one who lacks Jack's emotion.

As more headless and limbless torsos find their way into the Thames Dr Bond becomes obsessed with finding the killer. As his investigations lead him into an unholy alliance, he starts to wonder

Is it a man who has brought mayhem to the streets of London, or a monster?

'A compulsively readable story that starts as a conventional murder mystery and morphs, by degrees, into a horrifying supernatural thriller' Guardian.