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.
2/2 Nikki, Jack and DI Reed realise one of the victims was killed by a controlled sedative.
First broadcast: 18 Jan 2013
1/2 The murders of two women in a house basement force Jack to lock horns with an old flame.
First broadcast: 17 Jan 2013
2/2 Nikki, Jack and DI Reed realise one of the victims was killed by a controlled sedative.
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