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.

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.

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.