The Stairwell - eBook
Get the book from here.
"Nick is your regular high school sophomore - curious, inquisitive and with a thing for the uncanny. And, like most teenagers do, he too has a crush on a girl that he never catches up with. While the girl appears to be quite normal, she has a hard time showing up anywhere but the stairwell."
You can read the story here or get the download the book in multiple formats from Smashwords.