Thomas is a map-obsessed schizophrenic who spends his days and nights on a website called Whirl360, believing he's employed by the CIA to store the details of every town and city in the world in his head. Then one day, he sees something that shouldn't be there: a woman being murdered behind a window on a New York street. When Thomas tells his brother Ray what he has witnessed, Ray humours him with a half-hearted investigation - until he realises Thomas may have stumbled onto a deadly conspiracy, which puts them both in danger...
