Books that call out to me

Why does [this book](http://www.amazon.com/gp/product/0398070792?ie=UTF8&tag=mariusdotorg-20&linkCode=as2&camp=1789&creative=9325&creativeASIN=0398070792) call out to me? I’ve done so much logical security work in my professional career, but oftentimes the (perceived) simplicity of physical security systems seems so much more intriguing. Damn the $219 cost of the book: Locks, Safes and Security: An International Police Reference. I’ve had my eye on it for quite a while, and will order it one of these days.