unfolds in a series of achronological vignettes whose cumulative effect is chilling . 
(ROOT (S (VP (VBZ unfolds) (PP (IN in) (NP (NP (DT a) (NN series)) (PP (IN of) (NP (NP (JJ achronological) (NNS vignettes)) (SBAR (WHNP (WP$ whose) (JJ cumulative) (NN effect)) (S (VP (VBZ is) (ADJP (VBG chilling)))))))))) (. .)))
(ROOT (S (VP (VBZ ) (PP (IN ) (NP (NP (DT ) (NN )) (PP (IN ) (NP (NP (JJ ) (NNS )) (SBAR (WHNP (WP$ ) (JJ ) (NN )) (S (VP (VBZ ) (ADJP (VBG )))))))))) (. )))