In The Sunday Times bestselling novel `Darkhouse', Alex Barclay took you on a terrifying excursion to hell and back. In `The Caller', she leaves you stranded there...

One way in... no way out.

He targets victims in their own homes, subjecting them to a terrifying ordeal before leaving their lifeless bodies in their hallway for a loved one to find. at first the murders appear unrelated, the notion of a serial killer at large almost dismissed. But the killing hasn't stopped.

Back on the job after a year out, NYPD Detective Joe Lucchesi becomes the reluctant lead in the high-profile investigation. Battling with physical pain and tension in the task force and at home, he struggles to make progress.

Then just when he feels close to making a breakthrough, the investigation itself is rocked by tragedy, and the body count rises...