a literary detective story is still a detective story 
(ROOT (S (NP (DT a) (JJ literary) (NN detective) (NN story)) (VP (VBZ is) (ADVP (RB still)) (NP (DT a) (NN detective) (NN story)))))
(ROOT (S (NP (DT ) (JJ ) (NN ) (NN )) (VP (VBZ ) (ADVP (RB )) (NP (DT ) (NN ) (NN )))))