By Janet Soskice. The true story of the two sisters who discovered one of the earliest known copies of the Bible on Mount Sinai in 1892. Read by Stella Gonet. After the untimely death of both their husbands, the twins head to the monastery at Mount Sinai. While working in the library, Agnes stumbles upon a hidden palimpsest - one ancient document written on top of another. A Pier Productions production for BBC Radio 4.