Smart technology is everywhere.

It makes our lives easier, our connections faster and journeys quicker.

But in the wrong hands, it can kill…

Detective Amelia Sachs is hot on the trail of a murderer, chasing him through a Brooklyn department store, when her pursuit is fatally interrupted. An escalator gives way, forcing Sachs down into the machinery to help the man trapped in its depths… and enabling the suspect to flee.

But was it simply a freak accident? Could the killer’s presence in the store really be a coincidence?

As the body count threatens to grow, Sachs and forensic expert Lincoln Rhyme realise they are facing one of their most formidable opponents ever. Someone able to turn the most commonplace product into a murder weapon. Someone who can kill by remote control…