Folder deleted and I cannot find it

Anyone else that have experienced that a folder disappear? I cannot find it in Deleted files and I cannot find it if I search for it. All the important files, the dailly work, is in this folder.

What did you do before?

It seems now that the folder has lost it authorisation. Only root could see it, no users

You didn't answer to my question...

no I know, but I did not do anything unusual before.