An invisible on mainland Britain was the worst possible news. For Liz Carlyle, an MI5 Intelligence officer, this report from MI6 marks the start of an operation which will test her to the limit and put her own life in jeopardy. As she sifts the incoming evidence and gets reports from her agents she ...

An invisible on mainland Britain was the worst possible news. For Liz Carlyle, an MI5 Intelligence officer, this report from MI6 marks the start of an operation which will test her to the limit and put her own life in jeopardy. As she sifts the incoming evidence and gets reports from her agents she realizes there is an imminent terrorist threat.