David Eliezrie’s Undaunted highlights the courage of the Sixth Lubavitcher Rebbe, Rabbi Yosef Yitzchak Schneersohn, during the harshest years of Soviet oppression. While most religious leaders fled as the Communists closed synagogues and schools, Schneersohn remained, risking his life to sustain Jewish life and earning a reputation as “the last man standing.” Despite torture and a death sentence, his defiance led to his release through international pressure. Using historical documents and rare archives, Eliezrie shows how the Rebbe introduced Chabad teachings in Western Europe, empowered women, and built yeshivas to revive Chassidic life. The book also recounts his dramatic escape from Nazi Europe and his arrival in the U.S., where he famously declared, “America is Not Different,” sparking a transformation in Jewish life. It documents the deep personal relationship between the Sixth Rebbe and his successor, Rabbi Menachem Mendel Schneerson. Undaunted emphasizes that Schneersohn’s mission was driven by self-sacrifice, not martyrdom. Even in exile, he led Jewish resistance and laid the groundwork for Jewish revival worldwide, inspiring generations of Chabad leaders to persevere under oppression.