this masterfully calibrated psychological thriller thrives on its taut performances and creepy atmosphere even if the screenplay falls somewhat short . 
(ROOT (S (NP (DT this) (ADJP (RB masterfully) (VBN calibrated)) (JJ psychological) (NN thriller)) (VP (VBZ thrives) (PP (IN on) (NP (PRP$ its) (NML (NML (JJ taut) (NNS performances)) (CC and) (NML (JJ creepy) (NN atmosphere))))) (SBAR (ADVP (RB even)) (IN if) (S (NP (DT the) (NN screenplay)) (VP (VBZ falls) (ADJP (RB somewhat) (JJ short)))))) (. .)))
(ROOT (S (NP (DT ) (ADJP (RB ) (VBN )) (JJ ) (NN )) (VP (VBZ ) (PP (IN ) (NP (PRP$ ) (NML (NML (JJ ) (NNS )) (CC ) (NML (JJ ) (NN ))))) (SBAR (ADVP (RB )) (IN ) (S (NP (DT ) (NN )) (VP (VBZ ) (ADJP (RB ) (JJ )))))) (. )))