I'm thinking of writing something featuring the FBI, and I could use some pointers to set me heading in the right direction research-wise. Can any of you recommend some good non-fiction books on the FBI, and/or answer some dumb questions for me... ?
For example, if a federal witness was murdered at a WITSEC safe-house along with his US Marshal bodyguards, who would investigate the murder - the Marshals Service or the FBI? Would a US Marshal be assigned to assist/liaise with the FBI investigation? How does the FBI chain of command work at a national and local level? Does God exist? Who invented liquid soap, and why... ?