Kelly is a writer with a skeptical mind, especially regarding the paranormal. On her blog, she utilizes her acoustic physics expertise to reveal reported paranormal activity as fake, through low frequency sound waves. When a new case appears with an allegedly haunted subway station, Kelly assumes the challenge and emerges on a journey to reveal the truth. The investigation takes her far down into the abandoned station where everything she thought she knew about paranormal activity is put to the test. In the deepest darkness, Kelly is confronted by an unpredictable evil and is forced to fight against her own painful memories to find the truth and the light once again.