Sharon Roberts has never stopped grieving the loss of her murdered daughter, Ela, and journalist Cat, who grew up with Ela, has always been obsessed by her murder. The parole of her killer, Joe, leaves both women forced to confront the past.

Faith, a small-town Welsh lawyer, is forced to cut short her extended maternity leave when her husband and business partner, Evan, goes missing. As the truth of his actions surface, Faith must fight to protect her family and her sanity.

Loner Sam’s life is transformed when he comes into possession of a gun and starts to break the law. His ambitious policewoman sister Gina is paid to uphold it and makes it her mission to find the owner of the weapon. The family saga plays out against an inquiry into the shooting of a local businessman that raises questions for Sam and Gina about their father’s murder when they were young children.

Tom Mathias comes to Aberystwyth having abandoned his life in London. He’s a brilliant but troubled man. Despite his faults he is an excellent detective, who knows that the key to solving the crime lies not in where you look for truth, but how you look. From the windswept sand dunes of the coastline to the badlands of the hinterland, Y Gwyll is a series of four two-hour stories that are original and local, yet timeless and universal.