Life is not what it seems on the perfectly manicured, respectably affluent ‘Crud yr Awel’ housing estate. When the dead body of a young woman is revealed in the opening titles, we are immediately thrown back 35 days beforehand when an attractive young brunette moves into the estate. From that day until her demise, 35 days later, secrets of her past are revealed, and her neighbours are placed under suspicion of murder. ‘35 Diwrnod’ is an inverted mystery drama that places the viewer in charge of scrutinising events that lead to murder. As each day passes, cracks appear behind the closed doors of the apparently perfect residents’ homes, elicited by the mysterious young woman who has come to live among them. How she dies and who’s responsible is revealed in the final moments of the last episode.