Julia Green 
Children of Swallow Fell [PDF ebook] 

Driven from her home by war, Isabella must make the daunting journey with her father, to his childhood home in the north of England. Swallow Fell is deserted – another casualty of the conflict which has spread worldwide – but when her father goes in search of help, Isabella discovers that there are other children, just like her. They are surviving against the odds, but can Isabella and her new found friends learn to not simply survive but to thrive? Where there is love there is hope.