a mood in which an ominous , pervasive , and unknown threat lurks just below the proceedings and adds an almost constant mindset of suspense 
(ROOT (NP (NP (DT a) (NN mood)) (SBAR (WHPP (IN in) (WHNP (WDT which))) (S (NP (DT an) (ADJP (JJ ominous) (, ,) (JJ pervasive) (, ,) (CC and) (JJ unknown)) (NN threat)) (VP (VP (VBZ lurks) (PP (ADVP (RB just)) (IN below) (NP (DT the) (NNS proceedings)))) (CC and) (VP (VBZ adds) (NP (NP (DT an) (ADJP (RB almost) (JJ constant)) (NN mindset)) (PP (IN of) (NP (NN suspense))))))))))
(ROOT (NP (NP (DT ) (NN )) (SBAR (WHPP (IN ) (WHNP (WDT ))) (S (NP (DT ) (ADJP (JJ ) (, ) (JJ ) (, ) (CC ) (JJ )) (NN )) (VP (VP (VBZ ) (PP (ADVP (RB )) (IN ) (NP (DT ) (NNS )))) (CC ) (VP (VBZ ) (NP (NP (DT ) (ADJP (RB ) (JJ )) (NN )) (PP (IN ) (NP (NN ))))))))))