Madness is the only freedom

A gruesome discovery at a London school playground triggers a forensic link to an unusually violent unsolved murder.

The victim wasn't just killed. They were torn apart.

DCI Oswald Lennox and DC Olivia Blackwood believe the killer has struck again, and somewhere out there another body is waiting to be found.

As the case escalates, Lennox's failing mind becomes a liability he can no longer hide, and Blackwood's wild instincts pull her onto a collision course with a psychopath who believes the bloodshed is transforming them into something more than human.