The only child of over-protective parents, Sarah Lewis yearns to leave home. Studying hard to please them, she earns a place at Cardiff University. Here she is swept off her feet by handsome Gwyn Roberts, but when she becomes pregnant her parents are devastated and turn her from their door. All Gwyn and Sarah can afford are two squalid rooms in the infamous slums of Cardiff and Sarah soon realises she's made a terrible mistake. Gwyn becomes increasingly distant and when the baby dies in infancy, he leaves Sarah with little choice but to fall on her parents' mercy. But just when Sarah is starting to pull her life back together again, she is drawn to the charms of Stefan Vaughan and finds herself in trouble once more.