DCI Tom Mathias investigates the suspicious disappearance of Helen Jenkins.
Idris Williams is discovered bludgeoned to death at a remote farmhouse and the investigation into his murder reveals the mountain's bloody past.
In the remote village of Penwyllt, the body of young traveler Michael Reynolds is discovered in the murky depths of a quarry lake.
The body of a young woman is found abandoned but carefully placed in the marshlands, pushing DCI Mathias to the edge personally and professionally.
A fatal house fire case involving a child hits close to home for DCI Mathias; a detective's promotion at another's expense creates tension on the job.
Mathias finds himself under investigation by the IPCC following the death of Mari Davies.
Richard Harrington
Tom Mathias
Mali Harries
DI Mared Rhys
Alex Harries
DC Lloyd Ellis
Aneirin Hughes
Chief Supt Brian Prosser
Hannah Daniel
DS Sian Owens
