Ben Hall is drawn back into bushranging by the reappearance of his old friend John Gilbert. Reforming the gang, they soon become the most wanted men in Australian history.

When wannabe-singer Oscar is fired from her band and her boyfriend walks out, she heads to a remote cabin in the woods outside a ghost town called Tarnation to reflect on her life choices. But the woods are home to a demon unicorn, whose satanic master seeks Oscar's blood to complete a ritual that will raise Satan himself from Hell. Oscar must battle with a ungodly force of evil, capable of possessing any soul, to not only save her own life but to stop TARNATION descending upon the world.