Struggling single mother Orla finds herself in a desperate situation after being sent to Carlingford prison. There, she meets Kelsey, a young heroin addict, and Abi, a tough lifer.

Abi and Kelsey bond after the birth of Kelsey’s baby, Orla faces the consequences of her actions, and intense pressure builds in the prison.

Mark Cobden is sent to prison and has to learn quickly how to survive. When an inmate identifies prison officer Eric McNally’s weakness, he faces an impossible choice.

Mark is being bullied by fellow inmate Johnno. Does he tell the prison officers and be labelled a grass or risk the attacks becoming more and more violent? Eric’s son is attacked.

Six months on, Orla finds herself back in prison. Desperate for her kids, how far will she go to take action? Meanwhile, Abi considers revenge, and Kelsey plans for her future.

Mark suffers a tragic personal loss and is given the chance to leave prison for a day. Eric is forced to take greater risks to protect his family. But where will he draw the line?