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On All Things Considered this week (Sunday 17 October at 9am, repeated Thursday 27 October at 5.30am) Roy Jenkins discovers a story of an epic adventure.

Two middle-aged Scottish widows, twin sisters, trek for nine days by camel and on foot through one of Egypt's most daunting deserts.

At a monastery on Mount Sinai, the mountain where Moses was given the Ten Commandments, they are given access to two ancient chests - where beneath the parchment pages of a dirty damaged tome they discover one of the earliest and most important manuscripts of two Christian gospels.

It all happened at the end of the nineteenth century, but it's been brought to life in a book by Professor Janet Martin Soskice, who lectures on The Sisters of Sinai at Swansea University's Theology Public series this Friday.

Dr Soskice, professor of philosophical theology at Cambridge University, was brought up in Canada, but had a life-changing conversion experience as a student in the United States which eventually led to her becoming a Catholic She is a prolific writer and broadcaster and she lectures all over the world.

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