In August 1970, David Biale, a 21-year-old American Jewish student, arrived at Kibbutz Kfar Ruppin in Israel's Bet She'an Valley as a volunteer. There, he met Rachel Korati, nine days shy of her eighteenth birthday. They began an intense dialogue about how a secular Jew might be Jewish and what the role of Israel and kibbutz ought to be in modern Jewish life. They also found a common language in the counter-culture of the 1960s to which both were...