leads up to a strangely sinister happy ending 
(ROOT (S (VP (VBZ leads) (PRT (RP up)) (PP (IN to) (NP (DT a) (ADJP (RB strangely) (JJ sinister)) (JJ happy) (NN ending))))))
(ROOT (S (VP (VBZ ) (PRT (RP )) (PP (IN ) (NP (DT ) (ADJP (RB ) (JJ )) (JJ ) (NN ))))))