In the aftermath of a young's girl's midnight seance that awakens a long-slumbering, malevolent spirit, a band of runaway orphans teams up with an underground collective of saboteurs to rescue friends imprisoned in an industrial wasteland.

Thirteen-year-old Rory continues his mission to free the spirits of the Munsee Indians from their Central Park prison without starting a war among the residents of Mannahatta, a spirit realm that co-exists alongside modern-day New York City, filled with fantastical creatures and people from the city's colorful past.