Looking at Conan Doyle's real life detective work working toward the release of Oscar Slater, a German Jew convicted of the 1908 murder of Marion Gilchrist, a wealthy 82 year old spinster. A fascinating look into that portion of Conan Doyle's life as well as police practices and the judicial system of the time. Almost unbelievable to the modern reader Slater's case was a miscarriage of justice and the look into the prejudices and process that went into it were well researched and presented in a clear and engaging way, mixing in the lessons Conan Doyle applied from his own character Sherlock Holmes. A good reminder of how thankless the role of protecting the innocent can be when those innocent aren't very nice people, as well as the challenges and the desired role of the justice system through the lens of this case from the turn of the last century.