Bill Pullman ("Independence Day," "While You Were Sleeping") is Darryl Zero, a private detective who is as brilliant as he is reclusive, communicating with his clients only through his frustrated "legman," Arlo, Ben Stiller ("Flirting With Disaster," "Reality Bites"). When a wealthy business tycoon hires Zero to uncover the identity of a mysterious blackmailer, the detective must emerge from his shell. Soon, he finds himself falling for the only person who can match wits with him -- a beautiful young woman who may or may not be the ingenious blackmailer. Co-starring Oscar-nominee Ryan O'Neal ("Paper Moon," "Love Story").