where the film falters is in its tone . 
(ROOT (S (SBAR (WHADVP (WRB where)) (S (NP (DT the) (NN film)) (VP (VBZ falters)))) (VP (VBZ is) (PP (IN in) (NP (PRP$ its) (NN tone)))) (. .)))
(ROOT (S (SBAR (WHADVP (WRB )) (S (NP (DT ) (NN )) (VP (VBZ )))) (VP (VBZ ) (PP (IN ) (NP (PRP$ ) (NN )))) (. )))