An award-winning former advertising executive, Marshall Karp is a playwright and a screenwriter, and has written and produced numerous TV shows. Having paid his dues in Hollywood, he began killing the people he used to work with - in his novels - the Lomax and Biggs series.And then he started collaborating with James Patterson and the duo have concocted the NYPD Red Series. After six bestsellers, Marshall will carry the series forward on his own with NYPD Red 7 – out in the fall.But first, his new novel – just out - Snowstorm in August - imagines Central Park buried under tons of snow. Only it's not snow. It's cocaine.