To combat her depression after the loss of their child, Juliet is convinced by her husband Michael to accompany him on his latest work trip to the depths of the Tasmanian wilderness. Under medication and surrounded by the strangely gothic landscape, Juliet suffers hallucinations of an aggressive animal lurking within the darkness of the forest. Dismissing her visions as side effects of her medication, Michael sinks further into his work of studying the cancer that’s wiping out the Tasmanian Devils. But as Juliet overcomes her personal demons, she frighteningly realises that her hallucinations are actually real and Michael is causing a potential pandemic, forcing her to choose between saving her husband and saving the human race.