scariest custom story mods?

[Zaffre]

This has been asked countless times. Use the search function next time. Though, I can name a few worth checking out.

Followed by Death
Abduction
Through the Portal
La Caza
Poisonous
Escape (if you're into puzzles)
Gustav
Dark Room

White Night is an interesting full conversion. Also, what's the problem with the level? I might be able to help you out.

EDIT: Gee, nobody's ever asked this before!