The murder of a woman in 1939 makes this one of the oldest cases Lilly and squad ever tackled. The lady’s grand-daughter found a letter from the victim to her daughter, who was living apart from her, that starts the hunt for the killer. A stash of letters and several digs through the city’s crime record archives (see above) gets Philly PD’s finest on the trail. How is the mysterious “milkman” involved? And what’s all this talk about candy?