In 2017 the Salvator Mundi was sold at auction for $450m. But is it a real da Vinci? In a thrilling narrative built on formidable research, Ben Lewis tracks the extraordinary journey of a masterpiece lost and found, lied and fought over across the centuries. In 2017, Leonardo da Vinci's small oil painting, the Salvator Mundi was sold at auction for $450m. In the words of its discoverer, the image of Christ as saviour of the world is 'the rarest thing on the planet by the greatest human being who ever lived'. Its dazzling price also makes it the world's most expensive painting. For two centuries art dealers had searched in vain for the Holy Grail of art history: a portrait of Christ as the Salvator Mundi by Leonardo da Vinci. Many similar paintings of greatly varying quality had been executed by Leonardo's assistants in the first half of the sixteenth century. But where was the original by the master himself? In November 2017, Christie's auction house announced they had it. But did they? The Last Leonardo tells a thrilling tale of a spellbinding icon invested with the power to make or break the reputations of scholars, billionaires, kings and sheikhs. Lewis takes us to Leonardo's studio in Renaissance Italy; to the court of Charles I and the English Civil War; to Holland, Moscow and Louisiana; to the galleries, salerooms and restorer's workshop as the painting slowly, painstakingly, emerged from obscurity. The vicissitudes of the highly secretive art market are charted across five centuries. It is a twisting tale of geniuses and oligarchs, double-crossings and disappearances, where we're never quite certain what to believe. Above all, it is an adventure story about the search for lost treasure, and a quest for the truth.

Oswald Spengler was one of the most important thinkers of the Weimar Republic. In Oswald Spengler and the Politics of Decline, Ben Lewis completely transforms our understanding of Spengler by showing how well-connected this philosopher was and how, at every stage of his career, he attempted to intervene politically in the very real-life events unfolding around him. The volume explains Spengler's politics as the outcome of a dynamic interplay between his meta-historical considerations on world history on the one hand, and the practical demands and considerations of Realpolitik on the other hand.

Karl Kautsky (1854–1938) was the leading theoretician of the German Social Democratic Party and one of the most prominent public intellectuals of his time. However, during the twentieth century a constellation of historical factors ensured that his ideas were either gradually consigned to near oblivion or downright reviled. Not only has his political thought been dismissed in non-Marxist historical and political discourse, but his ideas are equally discredited in Marxist circles. This book aims to rekindle interest in Kautsky's ideas by exploring his democratic-republican understanding of state and society. These essential works from different points in his career demonstrates how Kautsky's republican thought was positively influenced by Marx and Engels—especially in relation to the lessons they drew from the experience of the Paris Commune.