The International Consortium of Investigative Journalists (ICIJ) launched a major investigation into the Swiss Leaks scandal, which revealed over $100 billion spread across about 100,000 clients in the Swiss branch of HSBC. The investigation involved over 150 reporters from more than 45 countries analyzing a dataset composed of over 60,000 files, including account files and company structures with multiple layers of ownership and interconnectedness. ICIJ used a graph database, specifically Neo4j, to organize and explore the massive leak, which included more than 270,000 nodes of data and 400,000 relationships. The investigation showed that HSBC staff were complicit in these seemingly questionable transactions and layers of accounts, using tactics such as code names and secrecy to obfuscate ownership. Linkurious, powered by Neo4j, was used to visualize the data and make it easier for journalists to analyze and understand the results. The investigation is a significant example of how graph databases can be used in big data journalism to uncover complex stories and reveal hidden patterns.