Paul was a cop. One night he was pulling second shift when he had a perfectly good idea: He'd stretch out in the back seat and take a little nap during his break.

In a way, it's the most classic cat-and-mouse game of all: A nimble graffiti writer dashes out into the night to leave his mark. Watching and waiting for him are the stronger—if less agile—NYPD Vandal Squad, whose sole mission is their arrest.