SOLVED. Sci-fi? series. There's a secret underground city/society (above ground is completely normal), and citizens are forbidden from going up. The book revolves around a group of fugitive kids and one of their mothers. Read around 2012-2014. [s]

[Devon]

The second book in a (I think 3) book series. I never read the other two books, so I don't know much about their plots. But I read this one around 2012-2014. No idea when it came out.

This is my first post, so I'm sorry if anything's wrong with here.

[Genesistrine]

The Tunnels series, maybe?

[Devon]

Genesistrine wrote: "The Tunnels series, maybe?"

Perfect. Thats it, thanks stranger.