The ghost manuscript - Kris Frieswick

Rare book authenticator Carys Jones wanted nothing more than to be left alone to pursue her obsession with ancient manuscripts. But when her biggest client is committed to an asylum, he gives Carys an offer she cannot refuse. In exchange for his entire library of priceless, Dark Age manuscripts, Carys must track the clues hidden in a previously unknown journal, clues that lead to a tomb that could rewrite the history of Western civilization.

But there are people who would do anything to stop Carys from finding what she seeks-for reasons both noble and evil. The hunt takes Carys to places she never thought she'd go, physically and emotionally; first to Wales, her estranged father's homeland, then to bed with Dafydd, a mysterious Welshman who agrees to help her with the search, and finally, deep inside her own psyche, when the monk who wrote the journal 1,500 years ago appears and assists her in her search.