Follow Phoebe, her older sister Becks, younger brother Perry and their mum who are living a comfortable life in Glasgow when suddenly they are uprooted from their lives and moved to the remote highlands of Scotland.
In a ruined and toxic future, thousands live in a giant silo deep underground. After its sheriff breaks a cardinal rule and residents die mysteriously, engineer Juliette starts to uncover shocking secrets and the truth about the silo.
