Nyns yw Kernow haval dhe gen tir vÿth rag yma hy cyvylta coth Keltek owth assaya dhe wetha y honen warbydn assaultyans an kensa cansvledhen warn ugans. Yth yw teylu Pengilley gwir-esely a'n bêwnans arnowyth-na ha scant nyns usons y ow powes dhe bredery adro dh'aga gwredhyow aga honen-erna wrella Sîra Wydn merwel ha gasa dhodhans cofyr hag ino paperyow podnek ha pot coth.

Yma an kemyn-na ow sordya viaj dhe dhyscudha termyn passys coynt an teylu hag orth aga helmy dres an spâss a voy ès dew cans bledhen gans Jacka, Mary ha'ga thry flogh, anedhys in pendra vunys wàr gòst gwyls an West a Gernow. Res o dhe Deylu Pengilley in dyweth an êtegves cansvledhen strîvya gans bohosogneth, gans peryllys an bal sten ha gans cowl-dys­wrians a'ga bêwnans ûsys dre davas nowyth esa ow kemeres posessyon a'ga fluw-an Sowsnek.

Yma Jacka ow tôwlel towl rag selwel y vêny ha'y ertach cùlturek saw yth ywa chalynjys gans taclow usy ow terry y holon hag orth y ladha ogasty. A yll y dhieskynysy styrya an desmyk gesys ganso i'n tavas Kernowek?-rag warbydn an kensa cansvledhen warn ugans yth esa an tavas-na in dadn gel-kepar ha cyta encledhys? ---

Cornwall is a land like no other where a Celtic culture struggles to hold its own against the onslaught of the twenty-first century. The Pengilleys are very much part of that modern life and hardly stop to consider their own roots-until Grandad dies and leaves a chest of dusty papers and an old pot.

The ensuing journey to uncover this strange past soon finds the family tied across more than two hundred years to Jacka, Mary and their three children living in a tiny village on the rugged coast of West Cornwall. The Pengilleys of the late eighteenth century battled poverty, dangerous mines and the eradication of their whole way of life by a new language taking hold in their parish-English.

Jacka sets about a plan to save his family and cultural heritage but faces challenges which break his heart and nearly cost him his own life. Can his descendants decode the puzzle he left in the Cornish language which, by the twenty-first century, lay beneath the surface-like a hidden city?