I can't speak from some definitive standard of prose, of course, but for me the weakest moments come when Brown narrates in meticulous detail things that don't need to be tracked so closely. I also find a lot of the descriptions a bit clumsy. For example (the underlining is mine):
Quote:Tiptoeing across the creaky wood floor to his closet, Sophie peered on the shelves behind his clothing. Nothing. Next she looked under the bed. Still nothing. Moving to his bureau, she opened the drawers and one by one began pawing carefully through them. There must be something for me here! As she reached the bottom drawer, she still had not found any hint of a doll. Dejected, she opened the final drawer and pulled aside some black clothes she had never seen him wear. She was about to the close the drawer when her eyes caught a glint of gold in the back of the drawer. It looked like a pocket watch chain, but she knew he didn't wear one. Her heart raced as she realized what it must be.
The "next" seems unnecessary to me; if it was put there to convey a sense of chronology, it's redundant because the sequence of events would have been clear even without it.
He doesn't need to specify that "she opened the drawers" because that is implied by her pawing carefully through them. I also don't think we need to be told that she pawed through them "one by one"--she wouldn't paw through them all at once, would she? Finally, it doesn't add any dimension of meaning to say that she "began" pawing through them rather than simply "she pawed through them." Unless something is going to happen to interrupt the pawing, we don't need to be told that the pawing "began."
Generally, when I encounter the construction "As she _________," I expect the independent clause to be an event rather than a general state of being--i.e. the word "as" implies that something occurred at the same time that something else occurred. Here, "As Sophie reached the final drawer" is (so the prose suggests) simultaneous with "not found a hint of a doll"... but not finding a doll was the case before, during and after her "reaching the final drawer"; it's not an event that was simultaneous with the opening of the drawer, but a condition under which she opened the drawer. Presumably what he means is that
by the time Sophie reached the final drawer, she had not found a hint of a doll.
"She was about to the close the drawer when her eyes caught a glint of gold in the back of the drawer." Having "the drawer" stated twice is kind of clunky. It would have sufficed to say "She was about to close the drawer when her eyes caught a glint of gold in the back," or even "She was about to close the drawer when her eyes caught a glint of gold."
"Her heart raced as she knew what it must be." Here's a case where Brown does use the "As she ________" construction properly (to my ears!), but the event he describes is redundant. We don't have to be told why Sophie's heart races--or if we do, it'd have been better to make us wait and discover it with her rather than having it spelled out for us.