In KL, Wachsmann fills this glaring gap in our understanding. He not only synthesizes a new generation of scholarly work, much of it untranslated and unknown outside of Germany, but also presents startling revelations, based on many years of archival research, about the functioning and scope of the camp system. Examining, close up, life and death inside the camps, and adopting a wider lens to show how the camp system was shaped by changing political, legal, social, economic, and military forces, Wachsmann produces a unified picture of the Nazi regime and its camps that we have never seen before. A boldly ambitious work of deep importance, KL is destined to be a classic in the history of the twentieth century. In KL (the widely used acronym for konzentrationslager, German for concentration camps), Wachsmann offers an unprecedented account of the development of the camps, similar in scope and approach to Anne Applebaum's bestselling and award-winning Gulag: A History (2003). We will publish on the 70th anniversary of the liberation of most of the camps in April 1945. Wachsmann is the first to synthesize a new generation of original scholarship on the camps, much of it only available in German and little-known in the English-speaking world. And he has unearthed a wide range of new documents, offering startling new revelations about the history of the camps.