When Holtzmann stays up late at the firehouse, she discovers something. Something she can't even believe exists. This was sort of inspired by a fic on ao3 called Benevolent Haunting. It's a Holtzmann/Erin fic, so if you like that go read it. (I don't own anything except my OC. If I change anything or stuff like that, I will put it along with the warnings at the beginning of the chapter)