As the hunt for a killer of two women intensifies, Nikki and Jack uncover a dangerous plot that threatens national security, whilst Leo fights to prove an imprisoned mother's innocence.
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Fri 18 Jan 2013 21:00
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Emilia discusses her ambitions and playing Nikki Alexander.
Richard Lintern talks about his character Thomas Chamberlain.
David Caves describes his instinctive character Jack Hodgson.
Liz describes her super-efficient character Clarissa Mullery.