The key to the Zodiac killer's ciphers was sent to Paul Avery in his 1970 Halloween card. A geometric shape signed by the sender aligns with the 340 and 408 ciphers like a Ouija planchette to reveal his motive, a theme from Tim Holt #30 Redmask meets Lady Doom and the Death Wheel: By Knife, By Gun, By Rope, and By Fire.
http://www.zodiackillersolution.org/
