The Blood Drops - Harvey Jerrell

This book is fictional about two serial killers who meet solely by accident on a plane. Who struck up a friendship, not knowing each had left their cities just ahead of the law, but could not leave before killing assuming the identity of their victims.  The police in New England and Florida search but could not find or figure out where the killers had done. The case would have gone cold if had not been for two New England officers who had vowed not to allow the case to die. Not knowing the one case would lead to a nationwide case of two different serial killers. One returning back home and the other visiting.