Gideon's Ring

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"One more piece. Archmedes' precious gear. And then it could all truly begin. And end. Spectacularly."

- Most likely Vesper 1, back cover of "Day of Doom".

Gideon's Ring was the ring of Gideon Cahill, hence the name. It played many roles throughout The 39 Clues, but the most important one was during Cahills vs. Vespers. Gideon suspected his ring contained extraordinary power, but he was never able to tap into it before he died. The 2nd most important duty of the Madrigals to protect the ring.