On a dark winter's night, a pregnant cow screams out in agony on Dan's Farm. Dan is trying to deliver he calf but there is a problem. Something has gone terribly wrong with the calf inside the cow. And Dan is terrified. Over the next 35 hours we slowly learn the shocking truth of what is happening on the farm; the biotech experiment gone wrong; the awful reality of what has been done to the cattle; and the physical danger that the five people on the farm find themselves in.