an action/thriller of the finest kind 
(ROOT (NP (NP (DT an) (NN action) (, /) (NN thriller)) (PP (IN of) (NP (DT the) (JJS finest) (NN kind)))))
(ROOT (NP (NP (DT ) (NN ) (, ) (NN )) (PP (IN ) (NP (DT ) (JJS ) (NN )))))