In a desperate bid to outrun a violent pandemic, Andy (Martin Freeman, The Hobbit: An Unexpected Journey) and Kay (Susie Porter, Star Wars: Episode II - Attack of the Clones) have holed up on a houseboat with their one-year-old daughter, Rosie. When their peaceful existence is shattered by an attack, Andy takes his family ashore to seek help for his badly injured wife. A grave decision as Andy, too, becomes infected and left with only 48 hours to find a new guardian for Rosie, before he transforms into one of the creatures they have fought so long to evade. Andy's fate soon becomes entwined with that of a young Indigenous girl, Thoomi, who could be his only passage into the community that can keep his child safe. Each in their own way, Andy and Thoomi both seek salvation... but they will need to work together if they truly hope to achieve it.