An Irish detective stumbles upon some valuables that might be connected to a terrorist plot.

Darren Reid"s killers escape. Christian tells Emer another bomb is expected. In Antwerp, billionaire Richard Melnick shows the site for his new European headquarters to his son James, Bibi"s husband. Soon the CAB team link drug dealer Reid to Fionn Brannigan—Bibi"s brother. She tells Christian she left Ireland because of her brother"s dodgy dealings. It emerges that Reid"s last call was to Fionn.

Rough diamonds are found in Fionn's offices; Emer links this evidence to the bombings and warns Fionn that his life is in danger; Christian discovers that one of Sana's friends has been beaten by a fellow officer.

As the search for Fionn begins, Christian suggests that Fionn's frequent travels to Surat, India, may point to a diamond connection.

While her team follows the money trail in Ireland, Emer and Christian discover the real identity of the bombers; a very unexpected source provides the investigation with invaluable information.

With someone now in custody, Emer and Christian face a desperate race against time to stop the final bombing and uncover who was really behind the terrorist campaign.