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.

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.

Three women are pulled together at Carlingford prison on the same day. Single mother Orla fights to keep her children out of care and tries to get her life back on track, heroin addict Kelsey is faced with a decision. Meanwhile, Abi is haunted by a sinister secret tha puts her safety at risk.

After six months on the outside, Orla finds herself back in Carlingford. Meanwhile, Abi contemplates revenge, close to breaking point. Kelsey sets her sights on transferring to the mother and baby unit.

Orla faces the consequences of her actions and suffers a personal loss whilst still struggling to reconcile with Kyle. With the support of Kelsey, Abi finally starts reckoning with her unresolved grief, and risks the judgement of fellow inmates.