*“USSR–Germany. 1939: Documents and Materials on Soviet-German Relations from April to October 1939,”* edited by Yuri Georgievich Felshtinsky, is a groundbreaking historical work that immerses readers in the complex and often contradictory relationship between two great powers on the eve of World War II. This carefully curated collection of documents and materials offers fresh insights into the political climate of the time, allowing readers to view the events from multiple perspectives. Covering the pivotal months from April to October 1939, when the world stood on the brink of a global conflict, the book provides unprecedented access to previously unpublished diplomatic correspondence, meeting protocols, and eyewitness testimonies. Felshtinsky, renowned for his work in history and political science, combines rigorous research with compelling storytelling, making this volume both an academic resource and an emotionally engaging narrative. Who is this book for? Primarily, it will appeal to historians, students, and anyone passionate about 20th-century history. Military history enthusiasts and political analysts will find valuable details that deepen their understanding of the factors leading up to World War II. Additionally, the book attracts a broader audience interested in international relations and diplomacy, as it explores themes such as alliances, betrayal, and the far-reaching consequences of political decisions. The topics examined are diverse and highly relevant. Felshtinsky emphasizes how ideology and political ambitions influenced decision-making, how personal interests of leaders sometimes overshadowed reason, and how these dynamics ultimately resulted in catastrophic consequences for millions. Readers will see how local conflicts unfolded amidst global upheaval and how these events shaped the destinies of nations and peoples. Felshtinsky’s meticulous sourcing and analytical approach distinguish his style. He skillfully blends facts with interpretation, making the narrative both informative and captivating. His previous works, such as *“Soviet Diplomacy during World War II”* and *“Secrets of Stalin’s Diplomacy,”* have earned widespread acclaim, and in this book, he continues to develop his ideas and perspectives, offering readers a unique window into history. *“USSR–Germany. 1939”* is an essential addition to the library of anyone interested in history, politics, and international relations. It not only broadens understanding but also prompts reflection on how history can repeat itself if lessons from the past are ignored. In today’s world of global conflicts and political intrigue, studying these documents is more relevant than ever. This collection is not merely a compilation of historical records but a profound investigation into how complex inter-state relations can lead to tragic outcomes. If you want to learn more about the events leading up to World War II and the factors influencing decisions in the Kremlin and Berlin, this book will serve as an invaluable source of information and insight.