Rhedeg i Parys

Ar ôl darganfod eu bod yn disgwyl babi, mae cwpwl ifanc yn dianc o ogledd Cymru ac yn dechrau bywyd newydd yng Nghaerdydd. Caiff y darpar dditectif Sally Morris ei chyflogi gan y teulu gofidus i chwilio am eu merch gan ddechrau ar antur gyffrous a pheryglus sy’n ei harwain i isfyd tywyll y brifddinas, diwydiant twristiaeth Aberaeron ac i galon lwgr y mynydd copr. After finding out they are expecting a baby, a young couple escape from north Wales to start a new life in Cardiff. Budding detective Sally Morris is employed by the frantic family to look for their daughter, starting a dangerous adventure to the dark underbelly of the city, west Wales tourism, and, ultimately, to the copper mountain's rotten core.