The next few Bond movies adhere closer to the books than the ones we've seen. We get a darker Diamonds are Forever, similar to the trailer Wooksta posted, and the plot is a hybrid of OTL's DAF and the novel version of You Only Live Twice (quite possibly switching out the Garden of Death for the old west town Spectreville from the DAF novel). At the end of the movie, Bond is knocked unconscious and develops amnesia, and Tiffany Case takes him in.
The sequel, The Man With the Golden Gun, is nearly identical to the book (aside from a location change for Live and Let Die's sake). Bond returns to MI6 HQ looking very dissheveled, and attempts to kill M. It's revealed that in between the end of DAF and the start of this movie, Bond was brainwashed by the KGB. Once de-programmed, he is given a chance to redeem himself by going to South Korea and assassinating Franscisco Scaramanga, one of the most wanted hitmen in the world and a current associate of the KGB. As he finds out, Scaramanga is part of a plot with some hotel developers to create friction between tourists and the people so that the locals begin to resent capitalism and return to communism, and there's something about a prostitution ring in there, but the driving force of the plot here is Bond's inevitable duel with Scaramanga.
The next Bond movie, Live and Let Die, is the traditional escapist fare rather than the character-based films of the first half of Lazenby's tenure. It's still kind of racist, and this time around, it incorporates the novel's "pirate gold money laundering scheme" plot.