A routine raid by the Irish Criminal Assets Bureau turns up diamonds that are linked to a series of bombings in Belgium. Detective Sergeant Emer Berry teams up with Belgian anti-terrorism cop Christian de Jong, to work the linked cases.
Darren's killers escape, while Christian tells Emer further bombings are expected. Billionaire Richard Melnick shows the Antwerp site for his new European headquarters to his son.
Diamonds are found in Fionn Brannigan's offices and Emer links this to the bombings and warns him his life is in danger. Christian learns Hadi has been beaten by a fellow officer.
Emer heads to Antwerp to help search for Fionn Brannigan, but just as the case seems to have hit a dead end, the discovery of a body and a forensics breakthrough changes everything.
While her team follows the money trail in Ireland, Emer and Christian discover the identity of the bombers. An unexpected source provides the investigation with vital information.
With Bibi now in custody, Emer and Christian face a desperate race against time to stop the final bombing and uncover who was really behind the terror campaign
The new lead detective of Ireland's Criminal Assets Bureau faces an immediate challenge after a co-ordinated cyber-attack targets her agency and Belgium's Counter-Terrorist Unit, seemingly in connection to the Brannigan case. Bibi Melnick resurfaces with some new and crucial information unveiling dark details on how her father-in-law Richard ran his company Trestford and reveals there's a mole in CTU.
DS Claire Wallace and CI Christian De Jong are shocked to discover who was behind the terrorist attacks, but as the body count grows, will they be able to prove it?
Bibi Brannigan's life hangs in the balance when a hitman arrives in Ireland. A PR disaster threatens Frances Swann's plans, forcing her to take drastic action.
In the aftermath of a chilling attack in Ireland, Claire heads to Antwerp to make contact with a key witness. When Christian hits a dead end in his investigation, help comes from an unexpected source.
As Claire and Christian close in on hard evidence connecting Trestford to the bombings, Frances Swann executes a callous plan to force Bibi to Antwerp.
In this gripping series finale, Claire and her CAB team are in a race against time to finally unmask those behind the terrorist bombings before the Antwerp port deal is signed. But their breakthrough comes at a very heavy price.
When investigative reporter Olatz Alzola and her family are brutally murdered in Bilbao, DS Claire Wallace is drawn into a case that links their killings to a CAB raid in Ireland.
Claire questions Alice, who reacts angrily, Jon and Claire identify Adam and visit his student residence, only to find it trashed by O'Neill. CAB Detective Liam Boylan uncovers CCTV footage of a man arguing with Nick, and forensic accountant Norah Dillon discovers Nick was funnelling money into a Liechtenstein account. Claire and Jon focus on Adama's PhD supervisor, Itziar Romero - unaware O'Neill is targeting her too
Romero tells Claire and Jon that Adama had been interviewing migrants for his thesis, and O'Neill is wounded while searching for the envelope.
Bruno is caught by police at Sanihaz, the medical waste facility Olatz had visited. He claims his cousin Tomas was responsible for the people-smuggling and murders.
O'Neill is hospitalised due to exposure to medical waste. Police raid haulage company KYV, where O'Neill worked as a driver on Pearse's recommendation.
Tipped off, Pearse diverts the truck however, the police seize the drugs as they're unloaded. Niamh admits Tar Le used K.Y.V. to remove waste.
