In the derelict house next door to a building site, Dawn lives with a young woman who says to call her Mum

Dawn loves the hole in the roof, where she can always see blue. She loves her book of birds and she loves Mrs Goring, the old lady who lives on the ground floor.

But when Dawn's medicine runs out and Mrs Goring disappears,

Dawn begins to see the world as it really is.

Next door, the new facility to hold children like her is almost finished.

But Dawn wants to live. Can she escape, find Mrs Goring and the truth about her family before the doors to the Sparehouse open?

The threat is grim, but hope is alive and well.

Is that enough to save a generation of 'spares' like Dawn?