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6/10 Nikki is blamed for leaking police information, while suspect Aaron goes to ground.
5/10 A body found in the Thames leads Nikki and Jack to a riverside community scarred by grief.
4/10 Having discovered a link between their cases, the team stumbles on a 20-year-old clue.
3/10 Nikki and Jack are at the centre of a media storm when a young schoolteacher disappears.
2/10 A horrific discovery pits Nikki and Jack against a killer preying on illegal immigrants.
1/10 When a people smuggler dies, Nikki encounters a desperate Syrian teenager.
10/10 As Nikki and Jack move closer to the truth, their lives are thrown into mortal danger.
9/10 A family murdered at a picnic leads the team to the female victim's estranged husband.
8/10 Jack leads the hunt for suspected killer Bruno, the brother of the shot teenager.
7/10 The shooting of a teenager in an armed police operation triggers a series of murders.
