A strong opening (I like symphony of bitter destruction) and some nice scene-setting and writing throughout.
However, this could do with a bit of a clean-up. Your tenses are distractingly unsteady (past: the only thing she could do, present: she clutches the red pendant, past: she knew he was out there ), and you have a tendency to over-describe (the dark, wooden entrance creaks open… transitioning from the eerie corridors into the office) when you could use those precious characters to better use elsewhere.
JonB