In the mountains, some secrets are deadlier than the storms.

A man wanders lost on a filthy night in the Black mountains of Wales.

Despite the valiant efforts of the rescue services, he does not survive.

Is this an accident? Or malice aforethought?

DCI Warlow and team are drawn into a mystery that soon spirals into more deaths and a poisonous trade.

A devious killer is abroad. One that cares for nothing other than their own twisted greed. The dragon's breath taints everything it touches.

And no one is safe.