ZODIAC CIPHERS
RICHARD GRINELL, COVENTRY, ENGLAND
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THREE INNOCUOUS EXCLAMATION MARKS

6/17/2026

 
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The Zodiac Killer employed only two pseudonyms between 1969 and 1987 in the form of "Zodiac" and "Me"---the latter of which appeared in the only known genuine mailing of 1974, when the Zodiac Killer sent the "Exorcist" communication on January 29th 1974. A signature that can easily be unearthed by taking a right shift of eight from each circled 8 in the Z13 cipher.

But it was the "Halloween" card on October 27th 1970 that again teed us up with the promise of his identity, by the Zodiac choosing a card with the introduction of "I feel it in my bones you ache to know my name. And so I'll clue you in". Knowing that this was written on the front of the card, one might have expected the Bay Area murderer to supply us with a humorous answer subtly concealed within the design of the card inner, just like "My name is" may have been followed by "ME ⊕" in the April 20th 1970 letter. This was covered extensively in a previous article, however, it appeared that the Zodiac Killer made a deliberate choice to add two exclamation marks to the "Halloween" card inner to compliment the third exclamation mark already present in the writing "But, then why spoil our game!".  The fourth was partially hidden by the the skeleton's right foot.
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In the earlier article it was shown that the Zodiac Killer placed "Peek-a-boo you are doomed" around the knothole of the tree, yet it was fashioned in such a way that the "ME" of "DOOMED" was noticeably larger and bolder than the rest of the text. The following letter "D" returned to normal size, but was followed by an oversized exclamation mark, effectively creating an emphasis on "ME!".(ME complimented by an exclamation mark). This mimicked the word to the right of the inner skeleton's left arm, which was the only part of the "cut and pasted" skeleton out of position compared to the original. The left arm had been accidentally or deliberately shifted to the right to obscure the "a" of "game" to spell "me!". This was not all.

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The phrase "PEEK-A-BOO" around the knothole is positioned so that "BOO" lines up with the personal pronoun of "ME". The "D" and exclamation mark is broken off to line up with the large "BOO!" (BOO and exclamation mark) in the center of the card inner, which in turn is tilted 45 degrees anticlockwise to line up with the "me!" by the skeleton's left arm, which just happens to be the only part of the skeleton out of place compared to the original (see below). So, did.the Zodiac Killer deliberately add two exclamation marks to the card inner to form a bridge to the third, positioned after "me" by the misplaced left arm? The Zodiac Killer would have lined up "BOO" with "ME" twice (with both "BOO'S" sitting at approximately 45 degrees on the card), and fashioned "ME" followed by an exclamation mark twice. Was this a further mocking joke to compliment the simplistic answer to the Z13 on April 20th 1970? A joke that the Zodiac Killer finally got tired of on January 29th 1974, when he eventually exorcised the true identity of himself. Did anybody really expect the Zodiac Killer to give us his real name?  
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    The Zodiac Killer may have given us the answer almost word-for-word when he wrote PS. The Mt. Diablo Code concerns Radians & # inches along the radians. The code solution identified was Estimate: Four Radians and Five Inches To read more, click the image.
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    The Zodiac Atlas: The Zodiac Killer Enigma by Randall Scott Clemons. Click image for details.
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    The Zodiac Killer Map: Part of the Zodiac Killer Enigma by Randall Scott Clemons. Click image for color version
    For black and white issue..
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Photos from Marcin Wichary, zAppledot, vyusseem, Alex Barth, Alan Cleaver, jocelynsart, Richard Perry, taberandrew, eschipul, MrJamesAckerley