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SINOPSIS

Part one of two. The body of 20 year-old Lorna Katz is discovered drifting in the River Lea, with evidence suggesting she was tied up somewhere before she floated downstream. However, the death takes on an ever-more sinister significance when the team discovers that Lorna was the best friend of Ruth Tresize, a teenager who disappeared three years previously, with the missing girl's mother Ali becoming fixated on Nikki for information, convinced that the two incidents are connected.