New York police officer is offered job in secret agency that deals with the crimes commited with aliens, who live on Earth. Or just visiting friends...
When wealthy businessman is killed after his visit to computer simulated reality his employee has to follow his footsteps to find who is behind that murder.
Spencer Olham is arrested under suspicion of being a replicant - android placed on Earth by alien species that is trying to colonize the planet. How can he prove that he is human?