The Mandelbaum Gate by Muriel Spark
When Barbara Vaughan's fiance joins an archaeological excursion to the Dead Sea Scrolls, she takes the opportunity to explore the Holy Land. It is 1961, and the nation of Israel is still in its infancy. For Barbara, a half-Jewish Catholic convert, this is a journey of faith, and she ignores warnings not to cross the Mandelbaum Gate from Israel into Jordan. An adventure of espionage and abduction, from pilgrimage to flight, The Mandelbaum Gate is one of Spark's most compelling novels, and won the James Tait Memorial Prize.