A mysterious illness has turned Leo into a phantom boy, enabling him to leave his body and explore the city as a ghostly apparition. While in the hospital, he befriends Alex, a New York City cop injured while attempting to capture a nefarious gangster who has taken control of the city's power supply, throwing the metropolis into chaos. Now they must form an extraordinary duo, using Leo's phantom powers and Alex's detective work to foil the plot and save New York from destruction.