Triple Cross (Alex Cross, #30)

Detective Alex Cross hunts down a serial killer who's murdering entire families--and who will next be coming for Cross. A methodical killer is targeting multigenerational families in and around Washington, DC--striking under cover of darkness, triggering no alarms, leaving no physical evidence of any kind. Alex isn't the only one investigating. Also on the case is a charismatic true-crime author who sees patterns the detectives miss. The writer calls "The Family Man" a perfect crime story. Alex knows there is no perfect crime--the investigation should never become the story. Unless the ending falls somewhere between fact and fiction.