Not since the Boston Strangler has there been such a twisted rash of serial killings as the Green Monster Murders. Once again Lieutenant Kay Boyd is recruited by the FBI – specifically because master criminal Null, her former CI, is now the CI of Special Agent Joel Thrawn and looks good for the murders. The only problem? Null is nowhere to be found – but not because of the murders. Null has gone to ground as he's being hunted down by The Gangsta Boyz, the street gang that he had once been the Shot Caller for until he was deposed by the conniving Ronald Brogan. Now he's laid up in a safehouse recovering from multiple gunshot wounds. Meanwhile, two villainous women from Null's past are carefully plotting his murder. They're hunting him down; the Gangsta Boyz are hunting him down and law enforcement is hunting him down. His only ally? A very much conflicted Kay Boyd.