On the outskirts of a future city in what used to be Sweden, Vidya and her dad live with others in a small community. The grown-ups talk about something lurking in the ruins of the city center, something they call “the Stray.” Vidya, who likes to do things her own way, pulls away from her friends. Today, she doesn’t want to help with the chores either. Instead, she’s worried about the strange threat outside their safe home. She decides to protect everyone from the Stray, but soon finds herself lost.