The Eternity Code is the third book in the Artemis Fowl series by Eoin Colfer, first published in 2003. It follows the young criminal mastermind, Artemis Fowl, as he faces his most formidable opponent yet. After creating a powerful computer known as the “C Cube” using fairy technology, Artemis plans to keep it safe by meeting with businessman Jon Spiro. However, their meeting goes awry, and Spiro steals the C Cube, forcing Artemis to seek help from the fairies to retrieve it. With the stakes high and time running out, Artemis and his allies must work together to outsmart Spiro and protect the dangerous technology. As the plot unfolds, themes of trust, memory, and the interplay between human and fairy worlds take center stage.