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