**A gripping historical true crime narrative that reads like the best of Conan Doyle himself (Karen Abbott, author of *The Ghosts of Eden Park* ), *American Sherlock* recounts the riveting true story of the birth of modern criminal investigation.** Berkeley, California, 1933. In a lab filled with curiositiesbeakers, microscopes, Bunsen burners, and hundreds upon hundreds of bookssat an investigator who would go on to crack at least two thousand cases in his forty-year career. Known as the American Sherlock Holmes, Edward Oscar Heinrich was one of America’s greatestand firstforensic scientists, with an uncanny knack for finding clues, establishing evidence, and deducing answers with a skill that seemed almost supernatural. Heinrich was one of the nation’s first expert witnesses, working in a time when the turmoil of Prohibition led to sensationalized crime reporting and only a small, systematic study of evidence. However with his brilliance, and commanding presence in both the courtroom and at crime scenes, Heinrich spearheaded the invention of a myriad of new forensic tools that police still use today, including blood spatter analysis, ballistics, lie-detector tests, and the use of fingerprints as courtroom evidence. His work, though not without its serioussome would say fatalflaws, changed the course of American criminal investigation. Based on years of research and thousands of never-before-published primary source materials, American Sherlock captures the life of the man who pioneered the science our legal system now relies uponas well as the limits of those techniques and the very human experts who wield them.