"Una" follows a young woman's journey to reclaim her past. Fifteen years earlier, Una ran away with an older man, Ray, a crime for which he was arrested and imprisoned. When she comes across a photo of him in a trade magazine, Una tracks him down and turns up at his workplace. Her abrupt arrival threatens to destroy Ray's new life and derail her stability. Unspoken secrets and buried memories surface as Una and Ray sift through the wreckage of their past.