They are also often much more violent and suspenseful than other mysteries .
These stories frequently show the activities of many members of a police force or government agency in their efforts to apprehend a killer who is selecting victims on some obscure basis .
members are also often much more violent and suspenseful than other mysteries .
These stories frequently show the activities of many members of a police force or government agency in their efforts to apprehend a killer who is selecting victims on some obscure basis .