an achingly enthralling premise , the film 
(ROOT (NP (NP (DT an) (ADJP (RB achingly) (JJ enthralling)) (NN premise)) (, ,) (NP (DT the) (NN film))))
(ROOT (NP (NP (DT ) (ADJP (RB ) (JJ )) (NN )) (, ) (NP (DT ) (NN ))))