The Last of the High Kings by Kate Thompson

In this sequel to the multi-award-winning The New Policeman, time has moved on and JJ has children of his own. Eleven-year-old Jenny is beginning to become difficult, skipping school, shedding her shoes, and spending too much time up in the hills, talking to goats and ghosts. JJ has a plan to sort out the problems with Jenny, but what he doesn’t realise is that Jenny has her own plans, and they are of way more significance to the family and to the whole human race than any of them could ever imagine.