Searching for horror book title

[crafter]

In the late 90's I read a book and can't remember the author or title. All I remember is a possible plane crash, a group of people living in a town and a land that existed underground. The entrance to the land was through the roots of a tree. I belive the creatures underground may have been demons.

[Ice.Maiden]

Come on fish - you must visit the library more often!

[tickledtrout]

Could be The Survivor by James Herbert

[mycats]

its not the survivor