<P> Artemis Fowl II, the 13 - year - old criminal mastermind, has created a supercomputer which he calls the "C Cube", from the stolen fairy LEPrecon helmets confiscated by Butler in the siege of Fowl Manor . It far surpasses any human technology made so far . Fowl meets Chicago businessman Jon Spiro in London to show him the Cube, in an attempt to buy a considerable amount of gold in exchange for keeping the Cube off the market . However, Spiro ambushes and outwits Artemis and steals the Cube . In the process, Butler, Artemis' bodyguard is shot by one of Spiro's staff, Arno Blunt . </P> <P> Artemis' demonstration of the Cube inadvertently detects Fairy technology below ground, causing a shutdown of all equipment in Haven city . In response, Commander Root sends Captain Holly Short to London to find what the disturbance was caused by . Naturally, she locates Artemis, who persuades her to revive Butler with fairy magic and the aid of cryogenics . The procedure saves Butler's life, but ages him approximately 15 years . Artemis reveals the Cube's existence to Holly and the LEP's technical expert Foaly, and Holly flies Butler and Artemis back to Fowl Manor to plan their next move . </P> <P> Spiro, meanwhile, has commissioned a mob family from Chicago to capture Artemis to break the Cube's Eternity Code keeping Spiro locked out of its software . By pure chance, one of its employees is the dwarf Mulch Diggums, who is sent along with the thug Loafers to Fowl Manor to do the job . Although Mulch is rumbled, Loafers is incapacitated by Juliet, Butler's little sister, who has just returned from a failed final test at Madame Ko's academy, where Butler trained to be a bodyguard . After a discussion with Root, who gives them 48 hours before he sends in a full Retrieval team, Artemis comes up with an elaborate plan to retrieve the Cube from Spiro's office in Chicago, involving the use of Holly, Mulch and Juliet . Root demands a mind - wipe of the three humans after the job is done, so Artemis leaves Butler in Ireland to ensure their memories survive . </P> <P> The heist is ultimately successful, with Artemis retrieving the Cube after tricking Spiro into entering a rival company's headquarters to steal their new products . The Chicago police immediately arrive to arrest Spiro and his associates, and Foaly wipes Artemis' movements from the CCTV . Holly and Juliet remove Artemis from the crime, and return with Mulch to Ireland . Although Arno Blunt escapes and tries to enter Ireland to kill Artemis, Butler has him detained and frightens him into confessing his crimes . Root then has the three humans mind - wiped, after Holly mesmerizes Artemis to see if there were any traces left to trigger his memories . However, Artemis tricks them all, as he has had Butler commission three sets of contact lenses to stop the process . Artemis reveals the location of several files he created to hide his knowledge of the fairy world . Artemis' actual plan to retrieve his memories involves Mulch Diggums . Artemis has the date of the search warrant of Mulch's cave changed to the day after his first arrest, rendering all subsequent convictions null and void . Artemis then hands Mulch a gold medallion before his mind - wipe, which is actually a computer disc containing all of Artemis' memories . Although Mulch is incarcerated, he takes comfort in the knowledge that "together they will be unstoppable ." </P>

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