In a dramatic final showdown, the undercover police team attempt to bust the Mimicas' drug smuggling operation. But they're in for an unpleasant surprise.

With Christian out of action, Hannah and Billy are at a loss - and it begins to look like the Mimicas will get away with their crime.

Hannah and Billy join forces once again to try to uncover the leak at Bristol Police HQ. Dubravka is joined by her nephew Goran and comes under pressure to shift the drugs. Meanwhile, Christian and Bianca find that Costa Rica isn't safe.

Stefan discovers that Christian has been meeting with Hannah. Will Christian be forced to take drastic action to protect himself?

Hannah and her new partner Billy start investigating the Mimica family. But a shocking discovery makes Hannah want to pull the plug on the entire operation.

Hannah and Billy hunt for the rat that betrayed them and finally make a break-through. This time Kane is prepared to listen. However, the closer they get to finally bringing down the Mimicas, the more danger they find themselves in.

Against her will Bianca is reunited with Dubravka and becomes a prisoner in her own home. Christian tries to get back to the UK undetected. Hannah and Billy uncover the mole and strike a deal with him before Dubravka can intervene.

Traumatised by what he's done, and hopelessly tangled up in the undercover investigation, Christian takes a trip with Davor that will reveal everything he needs to know.

When her lover and fellow police officer Sean goes missing, DI Hannah Laing launches an urgent manhunt.

The police close in on the Mimicas and DCI Harris in Bristol. Each fiercely determined to secure a better future for their families, the war between Hannah and Dubravka reaches a bloody conclusion.