Although 4th in the EMBRYO series, this reads fine as a stand alone. A terrifying serial killer who just targets couples, and leaves taunting notes for the NYPD signed CATCH ME... Police request the help of doctors Jill Raney and David Levine, police friends and detectives on their own. Both have helped when cops' hands are tied, but this killer is always a step ahead. He wears gloves and disguises, shoots victim pairs at random with an unregistered gun, and leaves no physical evidence or eyewitnesses. The killer draws closer, gripping New York City and the entire nation in horror, pulling Jill and David into the worst terror they have yet encountered.