Dark Signal. Deep in the heart of the isolated Welsh valleys, an eerie hush spreads throughout the deserted wilds. Stranded and terrified, single mother, Kate (Joanna Ignaczewska), finds herself entangled in an ill-thought-out plan: a midnight robbery about to take a dangerous turn.
On lookout for her boyfriend, and left trembling in the middle of a secluded forest, she quickly realises she is not alone. With her is the vengeful spirit of a murdered girl…
Meanwhile, across the valley at a local radio station, Ben (Gareth David-Lloyd) and Laurie (Siwan Morris) are midway through their last ever radio show. With the arrival of medium, Carla, and filled with determination to go out with a bang, Laurie and Ben are about to get much more than they bargained for.
Patching together fragments of ghostly sounds, they begin to unravel the clues to a frightening crime before doing do the unthinkable… making contact with the dead.