After mysteriously reappearing, the painting titled Salvator Mundi (The Savior of the World) was sold at Christie's for a record 450 million dollars in 2017. Attributed to Leonardo da Vinci after its discovery, what became the most expensive piece of art ever has unleashed passions while revealing the excesses of our time. But is it really the work of the Italian genius, or one of the greatest scams in the history of art?