Thirty years ago, 10-year-old Kris Barlow spent a summer by the lake playing with her imaginary friend. Now, thirty years later, Kris returns to the lake house, only to discover that Violet is still there, and she wants to play.

In a post-apocalyptic world inhabited by mystical spirits, a human sacrifice ritual goes wrong and a young woman named Seycia must navigate the dangers of the Underworld to protect the family she left behind from beyond the grave.