The Zodiac Strikes San Francisco

As schools close for summer vacation, there was a sense of relief throughout the city. At least there would be no school busses on the roads for the killer to target. Almost two weeks passed with no reported attacks. On monday, june 20, ninth, another suspicious envelope arrived at the offices of the chronicle. It had all the hall marks of a zodiac letter, except that, unlike those before it, this one wasn't specifically addressed to the editor. Inside was a map of san francisco with a location marked in the mount diablo area. Alongside the zodiac's cross hair symbol was the number 12, next to the letters s, f, p