Zodiac’s Halloween riddle and the Game of the Cuckoo

2020 version On October 27, 1970, Zodiac mails a modified Halloween postcard to San Francisco Chronicle reporter Paul Avery (misspelled "Averly" on the envelope).The message does not contain ciphers but it seems to hide a clue on his author's identity[1]. The Halloween cardThe images below were taken from photocopies examined by the FBI. Click to …