Season 2 shifts focus to a new CAB detective, DS Claire Wallace, who teams up with Belgian agent Christian de Jong to unravel a conspiracy linking diamond smuggling, bombings in Antwerp, and a mole within the Belgian CTU, all stemming from Bibi Brannigan's deal for immunity after her father-in-law's demise, uncovering a vast criminal network with escalating violence and high stakes for all involved.

Season 3 follows DS Claire Wallace and the Irish Criminal Assets Bureau (CAB) as they investigate a complex case originating from a Dublin raid, leading to murders in Bilbao, Spain, and uncovering a vast network of financial crime, migrant smuggling, a questionable charity, and a dangerous ex-con, forcing them to partner with Basque police as they chase 27 million pounds and a bigger conspiracy.