Detective Mike Nash thought that moving back to Yorkshire from London would give him a quieter life. Little did he know . . .

Mike Nash's son, 14-year-old Daniel, is walking the dog across the fields when he hears the sound of gunshots. He calls his dad, who races to the scene. There are four bodies buried beneath a rockfall in an abandoned lead mine, but there's no sign of the shooter.

Meanwhile, Nash's team investigates the murders of three criminals, part of a group known as the Country House Bandits. Four were due to be released from prison and expected to come home to substantial rewards for their silence.

But the first man is stabbed to death in his cell. The second is killed three days after his release. And the third is attacked on his way home.

The fourth man disappears without a trace.

What links the lead mine murders to the slaying of the Country House Bandits? And where is the fourth man?

With the body count rising, Nash and his team are pushed to the limit to find a ruthless killer.