Leo, an 11-year-old boy from New York, is a phantom boy: he can become invisible and fly through walls. He befriends Alex, a police officer temporarily stuck in a wheelchair. Alex was hurt by a mysterious gangster threatening the city with a dangerous computer virus. Together they form an extraordinary duo, with Leo in the air and Alex on the ground. They are forced to look after Marie, a willful journalist who goes in search of the crook and whom Alex secretly has a crush on. When Marie falls prey to the gangster, our duo has to wield all their powers to find her, and save New York from destruction.