The grandson and great-grandson of Chicago police officers, Chicago Police Detective James Sherlock was CPD through-and-through. His career had seen its share of twists and turns, but on this day, he was at the records center to see the case file for the murder of John Hughes, who was seventeen years old when he was gunned down in a park on Chicago's Southwest Side on May 15, 1976. The case had haunted many in the department for years and its threads led everywhere. More than forty years after the Hughes killing, he was hopeful he could finally put the case to rest. Then the records clerk handed Sherlock a thin manila folder. Sherlock could have left the records center without the folder and cruised into retirement, and no one would have noticed. Instead, he tucked the envelope under his arm and carried it outside.