Sophie is a troubled young girl, haunted by the abuse she suffered as a child and harbouring a deep fascination with the unexplained. In the hope of satiating her obsession with the latter, she instigates a trip to the Welsh countryside with four friends, aimed at tracking down the legendary Beast of Bodmin. It seems the mythical creature – often thought to be a large wildcat or fox – has caught the public's attention once more thanks to a spate of attacks on livestock and one local farmer. Armed with a video camera and a case of beer, the group head off into the woods but they soon uncover much more than they bargained for, with Sophie falling foul of a mysterious madman who locks her away in an apparent attempt to protect her from some unnamed terror.

Set during the 1960s in the fictional North Yorkshire village of Aidensfield, this enduringly popular series interweaves crime and medical storylines.