S Katie Maguire is at a loss. Last year, she and her team destroyed the biggest drug trafficker in Cork. So how is the city's drug trade at an all-time high? Meanwhile, a spate of violent attacks which leave victims severely disabled has brought confidence in the Garda to an all-time low. As Katie investigates, she realizes that the two cases might be connected. Someone is using brain-damaged victims to smuggle drugs into the country. And the only way to find out more is to go in undercover.