Episode 4: In the wake of the school shooting, the gunman is charged with Abbi's murder, and the investigation intensifies when it's revealed he is connected to the 'heart knot' murders. Meanwhile, a shocking personal confession comes to light.
Cast
Starring: Elen Rhys, Richard Harrington, Rhian Blythe, Ioan Hefin, Aled Pugh, Mali Ann Rees.
