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![](https://ichef.bbci.co.uk/images/ic/320x180/p0klstzl.jpg)
Episode 5
5/8 Wisting receives an anonymous note about an unsolved disappearance.
![](https://ichef.bbci.co.uk/images/ic/320x180/p0klswrr.jpg)
Episode 6
6/8 Another anonymous tip takes Wisting deeper into the murky unsolved disappearance.
![](https://ichef.bbci.co.uk/images/ic/320x180/p0klswsd.jpg)
Episode 7
7/8 Wisting's hunt leads him to Lithuania and a collaboration with Interpol.
![](https://ichef.bbci.co.uk/images/ic/320x180/p0klswsg.jpg)
Episode 8
8/8 New evidence appears to have led Wisting and the team to the killer they've been chasing.
![](https://ichef.bbci.co.uk/images/ic/320x180/p0hq7r78.jpg)
Episode 1
1/8 Wisting investigates when a six-year-old boy disappears from his grandfather's hotel.
![](https://ichef.bbci.co.uk/images/ic/320x180/p0hq7vxl.jpg)
Episode 2
2/8 A ransom demand arrives for Clifford, bearing a very cryptic message.
![](https://ichef.bbci.co.uk/images/ic/320x180/p0hq806r.jpg)
Episode 3
3/8 Still without a good lead in the kidnapping case, Wisting's under pressure to get results.
![](https://ichef.bbci.co.uk/images/ic/320x180/p0hqdb9g.jpg)
Episode 4
4/8 Clifford's father Andrew has also fallen into the clutches of the kidnappers.