Ah thank you! So I've only watched the show I was curious how close the books followed. Is there an artisan type killer who injects resin into their victims and makes them into sculptures?
The show to date has taken place during time not covered in the books. The killers of the week have been invented by the show.
We have seen some scenes from the books already, and we've heard a lot of direct quotes from the books.
Bryan Fuller has described himself as a Thomas Harris mashup DJ; he's taking the bits and pieces of the books and mixing them up for a new experience.
In the middle of S3, we're told, we're catching up to Red Dragon, which is the first book featuring Hannibal Lecter. They'll also be telling their version of Hannibal's backstory (which is in Hannibal Rising, the last book written but covers Hannibal's childhood), and some of the events from the novel Hannibal.
The biggest question is how much we might get of The Silence of the Lambs, since MGM owns the rights to the characters that originate in that book, and still haven't agreed to let the show use them.
I didn't go into too much detail, in case you still want to watch the movies and not have them completely spoiled.