Hi,
It sounds like the author has deleted there FF account. When an account is deleted all content and details are removed from the site.
This is always unfortunate especially when we lose members or content that we have become fond of.
The story could be on other content sites, so it might still be online, and other fans of the author or story may be able to help with this.
Take care,
c00kie
FF Team
9 months
