it 's a bad sign in a thriller when you instantly know whodunit . 
(ROOT (S (NP (PRP it)) (VP (VBZ 's) (NP (DT a) (JJ bad) (NN sign)) (PP (IN in) (NP (DT a) (NN thriller))) (SBAR (WHADVP (WRB when)) (S (NP (PRP you)) (ADVP (RB instantly)) (VP (VBP know) (NP (NN whodunit)))))) (. .)))
(ROOT (S (NP (PRP )) (VP (VBZ ) (NP (DT ) (JJ ) (NN )) (PP (IN ) (NP (DT ) (NN ))) (SBAR (WHADVP (WRB )) (S (NP (PRP )) (ADVP (RB )) (VP (VBP ) (NP (NN )))))) (. )))