With the technical assistance of Australian hacker Julian Assange, the talented journalist managed to penetrate the closely criminal world of the hacker underground in the USA, Australia and Great Britain. In addition to the neatly recorded technical details, the focus of the narrative is constantly on the living people behind all these penetrations. Sometimes brilliant to the point of genius, sometimes obsessive, many of these hackers became so involved in their “business” that they eventually became social outcasts. Some ended up with drugs and madness, for others the underground led to arrest and long-term imprisonment...

According to many, “Underground” became almost the only book in which the author deeply and thoroughly analyzed the computer underground .("Computerra")This is not just another book about the Internet. It focuses on the bizarre destinies and eccentric crimes of an extraordinary group of young hackers. A fascinating, highly readable book. Dreyfus has revealed one of the best-kept secrets of the intelligence services and created a book that is a pleasure and suspense to read...("Rolling Stone")