Proof - Episode Guide

A grisly find at Dublin Port prompts an investigation; journalist Terry Corcoran probes allegations of human trafficking from Eastern Europe to Ireland; a German banker reports the theft of his laptop and his car.

Maureen starts a new job for the Social Democrats as media-relations officer; Nina uncovers a credit card scam at the nightclub where she suspects her sister is being held.

When Terry taps his brother-in-law's financial expertise to analyze the data on the disc stolen from Erskine's apartment, he realizes that it points to a conspiracy of money laundering and campaign-finance violations. Meanwhile, frustrated by the authorities' inaction and bureaucratic red tape, Nina decides to take matters into her own hands to get justice for her sister.

Terry is furious when the paper quashes his exposé on Carrick at the behest of the police, so he goes to the campaign headquarters to confront Maureen, who then becomes determined to get to the truth. Meanwhile, Nina persuades Steffi to go to the police, who finally close in on the traffickers.

When a scientist at pharmceutical company Chemacran dies suddenly after promising him a big story, Terry begins investigating the company's antidepressant, Seraban, whose success has led to a forthcoming lucrative merger, while Maureen tries to get the scoop on J.P. O'Farrell, Chemacran's managing director.

Terry and Cora go to Plunkett's house and discover his dead body, which convinces them that both scientists were killed for their knowledge about Chemacran. Meanwhile, Maureen digs up dirt on the merger for her interview with O'Farrell.

Maureen probes the connection between the CEO of the American pharmaceutical company and a racist politician. Tessa cleans up the debris and graffiti from her shop in an effort to get on with her life. Terry and Cora suspect that Jake's blackout is tied to Seraban usage.

Terry connects politician Gerry Rogan's stake in the pharmaceutical company and his time on a government board overseeing the clinical trials of the drug Seraban. He rushes to confront O'Farrell before the merger deal is signed and more people are hurt, but Maureen might already be in danger.