This session outlines bespoke strategies for conducting investigations/prosecutions of child exploitation cases on the dark web. It illustrates the identification and subsequent prosecution of a senior hierarchical staff member heavily involved in multiple dark web child exploitation forums. The presentation emphasizes integrating open-source info to precisely pinpoint high-value targets by providing insights into supplementing and strengthening investigative undercover techniques including the application of social engineering. Additionally, this presentation will highlight the importance and value of interagency and international cooperation, specifically a solid working relationship between HSI and Argos. Challenges and lessons learned will be shared