The Official CIA Manual of Trickery and Deception has been available to the general public since 2010, and it should be in your pocket right now.
This declassified, Cold War-era training manual for CIA field agents offers step-by-step instructions on how to be Jason Bourne through the use of hidden weapons, slight-of-hand tricks, and the power of deception. Of course, this thing is laced with anti-Communist propaganda and a chapter titled "Surreptitious Removal of Objects by Women." It's a bizarre testament to the paranoia felt during the McCarthy era—but also a pretty badass guide to being a spy. These are the 10 best lessons (coupled with 1950s-era illustrations) from the manual.