An investigation begins.

(Click on the image for larger size.
Invisible Girl, Heroine: Chapter Three, Page Fourteen written and commissioned by Dr. Faustus of EroticMadScience.com and drawn by Lon Ryden is published under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License.)

The “creepy dark corridor” is an effective visual trope with many, many instantiations.

Good thing Maureen has brought her own light! Image found at Creepy Pasta.