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Ok I read this in grade 7, takes place after some kind of Nuclear War I believe. These people live under Mount Royal, Im fairly certain they speak French, but the book is written in English. They have for a long time, and they have a very efficient city. Earthquake happens, kid finds a crack in the wall at end of the city that leads to the surface. Meets a girl who lives on the surface in a village. Ring a bell??
Do you remember if there was a bunch of kids, and one of them could play a piano, and the adults didn't want them to leave, but they took a few kids and left anyway?
cause I might know the book your looking for if the above is so.
It's an Author C. Clark book if so...