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

With the discovery that another bombing is imminent, Emer and Christian's attention is drawn to a well-known Irish businessman with a very chequered past.

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.

A year after the bombings, Trestford boss Richard Melnick dies in Antwerp, and CTU's Christian de Jong remains under investigation for shooting Luca Rivera; in Ireland, Bibi Brannigan makes an offer to CAB, now led by DS Claire Wallace.

Bibi reveals that Richard orchestrated the bombings as a ploy to get Deputy PM Viktor Maes into power and buy the Antwerp port; using her statement, CTU draw a link to additional operatives, but Bibi has even more shocking intel to share.

Maes intercedes with the mayor to help Frances Swann, Trestford's new head, but backs out when a journalist approaches Swann's rival about the port deal; CTU learns Richard's cause of death, and Bibi lands in the crosshairs of an assassin.