This essay describes the Brazilian anticorruption operation known as Operação Lava Jato (“Operation Car Wash”), its findings, and its results based on cases tried up to March 2018. Told from the perspective of the federal judge of the Thirteenth Federal Criminal Court of Curitiba, in whose court most of the Lava Jato cases have been prosecuted, this massive criminal case offers lessons that may be useful to other anticorruption efforts. Preventing systemic corruption is a challenge, but it is a necessary step for the improvement of democracy.