continually challenges perceptions of guilt and innocence , of good guys and bad , and asks us whether a noble end can justify evil means . 
(ROOT (S (ADVP (RB continually)) (VP (VP (VBZ challenges) (NP (NP (NNS perceptions)) (PP (PP (IN of) (NP (NN guilt) (CC and) (NN innocence))) (, ,) (PP (IN of) (NP (NP (JJ good) (NNS guys)) (CC and) (ADJP (JJ bad))))))) (, ,) (CC and) (VP (VBZ asks) (NP (PRP us)) (SBAR (IN whether) (S (NP (DT a) (JJ noble) (NN end)) (VP (MD can) (VP (VB justify) (NP (JJ evil) (NNS means)))))))) (. .)))
(ROOT (S (ADVP (RB )) (VP (VP (VBZ ) (NP (NP (NNS )) (PP (PP (IN ) (NP (NN ) (CC ) (NN ))) (, ) (PP (IN ) (NP (NP (JJ ) (NNS )) (CC ) (ADJP (JJ ))))))) (, ) (CC ) (VP (VBZ ) (NP (PRP )) (SBAR (IN ) (S (NP (DT ) (JJ ) (NN )) (VP (MD ) (VP (VB ) (NP (JJ ) (NNS )))))))) (. )))