For me it was the german book "Das Chaos Computer Buch", which is basically a retelling of CCC shennanigans in the 80s. It has just the right mix of adventure,

For me it was the german book "Das Chaos Computer Buch", which is basically a retelling of CCC shennanigans in the 80s. It has just the right mix of adventure, humour and technicality to get a 13 year old interested in hacking and computers.