As the station prepares to close down for good, DI Georgie Strachan is running out of time to find out what is really going on in Burrowhead and put a stop to it. A deadly drug appears in the small Scottish village, best consumed with the blood of a freshly slaughtered animal. But what does this have to do with the deaths and suicides? And who is responsible for supplying it?

As rituals and threats reach a frantic high, no one wants to speak. It seems the drug is ingrained in the very fabric of the village. Suspects abound as Georgie questions who she can really trust.