Nancy Drew must solve a mystery in a haunted mansion in San Francisco, where a treasure is believed to be hidden. However, she's not the only one interested in the mansion, as others have secrets to hide.
The game follows Nancy as she uncovers the truth behind the strange happenings at the mansion, which includes ghostly inhabitants and mysterious characters with their own agendas. Players must help Nancy solve a large number of puzzles, some of which are affected by the chosen difficulty level or time of day in her bedroom.