Jeffery Deaver: Death of a Blue Movie Star [2001] paperback

She calls herself Rune. She lives a downtown life and works running errands for a couple of documentary filmakers. At twenty-one, she's nowhere, and that's not where she wants to be. So, armed with a borrowed Betacam, she embarks on a freelance career of making movies herself. Unfortunately her first attempt - within the hallowed walls of the XXX Velvet Venus Theatre - was unexpectedly interesting. A bomb takes out half the cinema and a number of patrons. Rune, however, sees the possibilities and decides to track the culprit through the New York underworld - with her camera in tow, as well as Bomb Squad Detective Sam Healy. And thus begins her journey into the heart of the city of neon nightmares...