in watching the resourceful molly stay a step ahead of her pursuers 
(ROOT (PP (IN in) (S (VP (VBG watching) (S (NP (DT the) (JJ resourceful) (NN molly)) (VP (VB stay) (ADVP (NP (DT a) (NN step)) (RB ahead) (PP (IN of) (NP (PRP$ her) (NNS pursuers))))))))))
(ROOT (PP (IN ) (S (VP (VBG ) (S (NP (DT ) (JJ ) (NN )) (VP (VB ) (ADVP (NP (DT ) (NN )) (RB ) (PP (IN ) (NP (PRP$ ) (NNS ))))))))))