County of origin: Didn't ask yet.
Date: Didn't ask yet.
This looks easy at first glance because there is a lot of seemingly specific info but it doesn't come up for me.
A group of nine young people traveling in two cars get lost in a fog. After the fog clears they begin to disappear one by one. After each missing person they find a drawing.
Later, the group enters a mansion, they explore it room by room and they try to uncover some mystery inside.
Eventually they discover a company of eight people, who are striving to achive immortality somehow.