works on the whodunit level as its larger themes get lost in the murk of its own making 
(ROOT (S (VP (VBZ works) (PP (IN on) (NP (DT the) (NN whodunit) (NN level))) (SBAR (IN as) (S (NP (PRP$ its) (JJR larger) (NNS themes)) (VP (VBP get) (VP (VBN lost) (PP (IN in) (NP (NP (DT the) (NN murk)) (PP (IN of) (NP (PRP$ its) (JJ own) (NN making))))))))))))
(ROOT (S (VP (VBZ ) (PP (IN ) (NP (DT ) (NN ) (NN ))) (SBAR (IN ) (S (NP (PRP$ ) (JJR ) (NNS )) (VP (VBP ) (VP (VBN ) (PP (IN ) (NP (NP (DT ) (NN )) (PP (IN ) (NP (PRP$ ) (JJ ) (NN ))))))))))))