Sarah is a teenager living with her parents in an isolated house in post-collapse Canada. The world outside has run out of clean water, and her family is sitting on one of the last safe supplies. When a man appears in one of their security traps claiming to be the nephew her parents believed was dead, the family fractures over whether to trust him, and Sarah ends up at a cult compound looking for the parts that could save their filter and their lives.
After the mayor of an idyllic island village discovers a child with mysterious powers awash on their shores, the once peaceful community devolves into civil war, torn over the belief that the child is the next saviour.