NYPD Red - James Patterson

The first book in the bestselling NYPD Red series, from the world's foremost thriller writer.
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Every cop wants to be part of NYPD Red.
The elite team in New York's police department, they handle the headline cases - the ones involving the city's most high-profile people. For Detective Zach Jordan, it's his dream job - but he's about to step into a nightmare.
At a major film festival, a maniac begins a brutal public killing spree. His target? Hollywood's biggest stars.
Zach is assigned a new partner, Detective Kylie MacDonald - his ex-girlfriend. But they'll need to put their history aside to have a chance of stopping this homicidal psychopath before he brings New York City to its knees...