Rhiannon summons the spirit of her deceased great-grandmother Narelle for help after her father and uncle are arrested. Narelle agrees to lead Rhiannon and her cousin Elysium through secret elf tunnels beneath the city to find witnesses that can help exonerate their family. They escape the house with Rhiannon's younger siblings and make their way to a cottage where an old man named Mr. Smith lives, who seems to recognize a secret code phrase related to Narelle.