In God Hidden, Whereabouts Unknown, Netanel Miles-Yépez and Rabbi Zalman Schachter-Shalomi offer little-known stories of the kabbalist, Isaac Luria, and explore the profound implications of the kabbalistic idea of Tzimtzum, the 'contraction' of God that allows for creation, through different paradigms of Jewish belief over the centuries, and look at its function in Judaism and Jewish practice today.