Catapulted to national attention by the prime-time TV show Ghost Hunters, Maine’s Fort Knox draws visitors by the thousands both for its glimpse into Maine’s military past and for its supernatural aspects. Since no battle was ever fought there, the identities of the spirits inhabiting the fort remain a mystery.

In her search for answers, author Liza Gardner Walsh spent several nights locked in the fort with the East Coast Ghost Trackers. She explores the history of the region, going back to before the fort was built, interviews the staff, provides eyewitness accounts of ghost sightings, and offers a fun look at how the fort makes the most of this spooky attention by hosting its annual summer Paranormal/Psychic Faire and Fright at the Fort—called the “best Halloween experience in Maine.” You will never look at Fort Knox the same way again.