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?
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.
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.
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.
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.
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.
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.