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Following the murder in the public library, River and Ira must track down the killer. Their journey takes them deep into the world of the undocumented migrant community in London, a world of international hostels and immigration lawyers. They begin to get a sense of what it was that Stevie might have been unravelling before she died. Was it these investigations she was punished for?

And as River finds himself back at the hearing voices group, an unfortunate contribution leads to River being drawn closer to Rosa, his colleague and counsellor. But as River finally finds some solace, Ira is led into the heart of the storm, and the spotlight is thrown onto somebody with an awful lot to lose.