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Sara Eden isn't like other agents. She was the greatest asset MI5 had ever had. But then she disappeared without a trace.
Now, she's out of hiding. And she'll do whatever it takes to save innocent lives.
Robert Waterman is the director of GCHQ. He trusts numbers. He trusts data. He's learned that whilst humans are unreliable, patterns and codes never lie.
But then he meets Sara. What Sara can do isn't rational. What Sara can do defies logic. He can't trust her - but he needs her.
Furiously paced, there is nothing derivative about this debut. A young girl is locked in a sensory deprivation tank; years later she begins to piece together the fragments of her past. The action that follows is cleverly inspired by a real-life figure, Helen Duncan, a Scottish medium who came to the attention of Winston Churchill during the Second World War