"Welcome to Primary Source Investigations, your definitive destination for evidence-based true crime analysis and the unraveling of unsolved mysteries. Are you searching for more than just sensationalized storytelling? Do you crave a deeper understanding of the intricacies behind the world's most baffling cold cases and chilling disappearances? Then you've found the right place. We delve into the heart of unsolved mysteries with rigorous primary source analysis, moving beyond speculation to present factual, evidence-driven narratives. Our focus is on investigative journalism, meticulously examining FBI files, declassified documents, and the NamUs database to shed light on cold cases that have long remained in the shadows. We explore a wide range of topics, from historical cold cases that continue to haunt us to contemporary missing persons cases that demand answers. We investigate the Springfield Three evidence, scrutinize the Brian Shaffer disappearance, and explore the tragic Sodder children fire. We dissect the Lars Mittank explained theories, revisit the haunting Beaumont children case, and delve into the Flannan Isles mystery. This channel is dedicated to providing a true crime deep dive for the intellectually curious. We utilize principles of criminology and forensic science to analyze evidence and reconstruct events. We utilize the resources of organizations like The Doe Network, The Charley Project, and the Cold Case Foundation to amplify the voices of the missing and support ongoing investigations. Website: https://www.youtube.com/@PrimarySourceInvestigations. Phone: +12676979771. Address: 4080 Spring Avenue, Pennsylvania, 19108 Philadelphia, United States."