If you want to know more
Agnes Smith Lewis, In the Shadow of Sinai: A Story of Travel and Research from 1895 to 1897 (Cambridge: Macmillan & Bowes, 1898).
Margaret Dunlop Gibson, How the Codex Was Found : A Narrative of Two Visits to Sinai from Mrs Lewis’s Journals, 1892-1893 (Piscataway NJ: Gorgias Press, 2001).
Modern accounts
Allan Whigham Price, The ladies of Castlebrae (London: Headline, 1987).
Janet Soskice, Sisters of Sinai: How Two Lady Adventurers Found the Hidden Gospels (London: Vintage, 2009).