The lives of four strangers from different backgrounds, including an airline hostess, an Afghan refugee, a father and a bureaucrat, become intertwined at an immigration detention centre.

Clare Kowitz arrives at Barton with high ambitions as the new general manager, however she is shocked by the extent of the facility's dysfunction.

Clare continues her relentless search for the leak in Barton; Cam struggles with his conscience; Sofie finds out about an ambitious escape plan.

A peaceful protest becomes chaotic when detainees break out of Barton; Clare struggles with the fallout; Cam finds out that Janice is harbouring the escapees; Ameer attempts to keep the secret of how he made it to Australia.

Tensions are high as Clare finds it difficult to keep control of Barton; Sofie's mental health deteriorates, as the memory of what Gordon did to her resurfaces.

Margot comes across a discovery that leads her to believe that Sofie is imprisoned at Barton; Clare cuts a deal with Ameer that could change his and Mina's future.