Want a summer read that’s part adventure story, part biography, part introduction to biblical manuscripts, part historical drama, and part faith journey? If yes, check out Janet Soskice’s The Sisters of Sinai. The main characters are identical twins Agnes and Margaret Smith of Scotland. Their travels lead, among other places, to St. Catherine’s Monastery in the Sinai. There Agnes discovered one of the oldest manuscripts of the Gospels ever found. The sisters’ staunch Presbyterian father, widowed shortly after their births in 1843, raised his girls as one might raise boys in the Victorian era—educated, physically active, and engaged in the life of the mind. And he kept a promise that…