The Ian Fleming's James Bond series of geocaches is to honor the amazing original books (not the movies). It is placed along a section of General Crook trail originating from the Rim Trailhead. A regular sized geocache. Designed for biking, this powertrail is spaced .25-.5 miles between geocaches (because 0.1 mile spacing on a bike is very tedious).
Diamond are forever is Bond's fourth book in the series. It is unique in that, instead of being concerned with SMERSH, SPECTRE, or international counterintellience, it is simply a story about economic issues: finding a source of diamond smuggling and stopping it. Bond goes up against the "Spangled Mob," a US mafia based in London, New York, and Las Vegas. It has some colorful characters, including Tiffany Case, "Shady Tree," and the infamous sadistic killers Wint and Kidd. The opening section is Ian Fleming's description ability at it's finest, especially if you don't like scorpions.
To find Diamonds are forever, look for a group of rocks between the General Crook Trail and powerline road.
Diamonds are Forever does NOT contain a clue to the James Bond Letterbox.