Progressively getting better. I’m liking Banks and I’m liking this series. A young girl is handed over to the ‘authorities’ and is subsequently reported missing. So who were they? A nice young man with a lovely smile and a women both well dressed and said they were from Social Work? Would you hand over your daughter? 
Then a body is found out in the wilderness and everyone fears the worst as Banks is head of both. I’ve read enough of his books to discover that the two stories must be linked. Of course the second body is of a male and so the investigation begins. Where would the links be? And, are they indeed linked? You will have to read to find out. Good plots and execution