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After some flooding, the badly decomposed body of a teenage girl was washed up in the fens outside Cambridge. The major problem for DI Chloe Frohmann and DCI Morris Keene isn't how she got there - but ''who'' she is. There's no identification on her and despite the fact that she's obviously been dead for some time no one seems to have missed her. No family is in distress. No friends are worried about what has become of her. No employer is concerned about what has happened. Meanwhile, in Cambridge Mathilde Oliver the daughter of a don is trying to trace the ''Katja''. Letters are being delivered to Corpus Christi College addressed to her, but she doesn't seem to exist. Also at the university a student dropped out of her course: Grace Rhys was uncertain about whether or not she wanted to study Maths and took a job as a nanny at Deeping House, the home of three families, another nanny and a young writer.