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When the most powerful intelligence organisation neglects individual freedom in the modern information space, it's up to hackers to defend it! One of them has created a virus that will disable a supercomputer containing a dossier on every Internet user. Will mathematician Suzanne Fletcher be able to neutralise it to prevent the balance of power from being upset? How can the secret anti-virus code be extracted from the hacker's golden ring, lost somewhere in Spain? The plot unfolds super fast, with puzzles and surprises at every turn, so even the most experienced readers will question their own guesses.