John Boyne 
Stay Where You Are And Then Leave 

The day the First World War broke out, Alfie Summerfield”s father promised he wouldn”t go away to fight – but he broke that promise the following day.
Four years later, Alfie doesn”t know where his father might be, other than that he”s away on a special, secret mission.

Then, while shining shoes at King”s Cross Station, Alfie unexpectedly sees his father”s name – on a sheaf of papers belonging to a military doctor. Bewildered and confused, Alfie realises his father is in a hospital close by – a hospital treating soldiers with an unusual condition.
Alfie is determined to rescue his father from this strange, unnerving place . . .