"What binds us pushes time away." So wrote David Oppenheim, scholar, collaborator and then critic of Sigmund Freud, participant in the intellectual and cultural highs and lows of early 20th-century Vienna, victim of the Nazis, and grandfather of philosopher Peter Singer. Fifty years after Oppenheim's death, Singer found a wealth of written materials, including intimate personal letters his grandparents had sent to each other, which provided startling insights into their relationship - and a vivid picture of the man Singer never met. Their lives were bound by a passion for understanding universal values and human nature that did 'push time away'. In recreating his grandfather's life, Singer gives readers a rare glimpse into the controversial, vibrant, and most intensely Jewish intellectual life in Europe.