Something is stalking the Northumberland moors. No one is sure exactly what it is, but something is slaughtering sheep and other livestock. There have been sightings of a "big cat," a huge, feral creature that has so far managed to elude capture. Some of the locals are terrified, while others scoff that it's only a legend. Still,the killings continue.

Cath Lane is a young novelist and mother, eager to explore her new home in rural Northumberland. To her, the legendary beast of the moors is excellent fodder for a new novel. How could she know as she begins her research that the beast is no mere myth？How could she foresee the terror that waits for her, crouching in the dark...