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10/10 With Nikki locked in a struggle for survival, Jack faces the biggest choice of his life.
9/10 Nikki travels to Mexico following the violent death of her friend in a carjacking.
8/10 Nikki connects with a traumatised Becky, while Jack and Clarissa head to Max's lab.
7/10 Clarissa's husband Max is brought to the Lyell Centre to help crack a case.
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.