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A routine raid led by Emer Berry, a detective in the Irish Criminal Assets Bureau, reveals that a small-time drug dealer has been receiving substantial funding from a seemingly untraceable source – not in cash, but in rough diamonds. When these diamonds are linked to a series of bombings in Belgium, Emer is forced to work with Police Commissioner Christian De Jong.
When investigative reporter Olatz Alzola and her family are brutally murdered in Bilbao and 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 funneling money into a Liechtenstein account.
An envelope Adama sent to his supervisor, Romero, goes missing.
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, but the police seize the drugs as they're unloaded. Niamh admits Tar Le used KYV to remove waste, but denies knowledge of the drug smuggling
