Hello!
My primary school DS is very interested in 'security', like cctv, locks, security passes , voice recognition etc. He loves hearing about high security places, eg the Bank of England, Fort Knox, loves observing security details at the airport or wherever. I'd love to get him a book about 'the most secure places on earth' or something like that, there are blogs and websites with some lists, but I can't find ANY books on the subject. Anyone happen to have any ideas please??