what 's missing in murder by numbers is any real psychological grounding for the teens ' deviant behavior . 
(ROOT (SINV (SBAR (WHNP (WP what)) (S (VP (VBZ 's) (ADJP (VBG missing)) (PP (IN in) (NP (NP (NN murder)) (PP (IN by) (NP (NNS numbers)))))))) (VP (VBZ is)) (NP (NP (DT any) (JJ real) (JJ psychological) (NN grounding)) (PP (IN for) (NP (NP (DT the) (NNS teens) (POS ')) (JJ deviant) (NN behavior)))) (. .)))
(ROOT (SINV (SBAR (WHNP (WP )) (S (VP (VBZ ) (ADJP (VBG )) (PP (IN ) (NP (NP (NN )) (PP (IN ) (NP (NNS )))))))) (VP (VBZ )) (NP (NP (DT ) (JJ ) (JJ ) (NN )) (PP (IN ) (NP (NP (DT ) (NNS ) (POS )) (JJ ) (NN )))) (. )))