The Aubrey/Maturin series by Patrick O'Brian - yes, I know there's been a movie (Master & Commander with Russel Crowe and Paul Bettany) but the series is much richer and deeper than any single movie could be.

Also, Robin Hobb's Realm of the Elderlings series. Concentrate on the Fitz storyline, maybe give the Liveship series a miss.

I mentioned Daemon and Freedom^TM^ by Daniel Suarez in another thread recently. I've often thought they'd make good Techno Thrillers. They got optioned once but I think it expired.

I think part of the problem is that the second book is a conclusion to the first. One falls flat without the other. So I think they'd be best suited to a single mini-series of 6 or 8 hour long episodes. And studios want franchises.

Elf Quest

Monstrous Regiment by Terry Pratchett. I think that would be a great book to adapt.

Haroun and the Sea of Stories

All the Muderbot series

Old Man’s War series

Camp Damascus by Chuck Tingle. I was expecting a trashy slasher with some queer elements and an autistic protagonist, what I got was a good supernatural thriller with some queer elements and a very believable autistic protagonist - I would genuinely recommend it.

The writing is the weakest part, it feels very kind of pedestrian, like "here's some words explaining what's happening" rather than being artistic or beautiful or evocative but it's good enough for the story and characters to come through, and they're great. So remove the writing quality from the equation and it could be absolutely excellent

Michael Morecocks Eternal Champion saga. Great candidate for a Netflix animation

Not a book exactly, but East of West would make for some great narrative and world building.

There already has been a movie (L.A. Confidential), which is one of my favourite movies of all time. But to get it on the screen required a lot of rewriting to fit a complex weave of plots that intersect and takes 10 years to resolve. It was brilliantly done for what it was, but it left a LOT on the floor.

I would love love love to see an HBO or similar series that is as true to the novel by James Ellroy as it could possibly be.

Zero. It totally destroys everything about a book. I have found though that horrible series can make good TV. Like Twilight or Dexter or Harry Potter. Horribly written trash but popular with those in the center of the bell curve.

The Green Bone Saga by Fonda Lee.

The Gap Cycle series

LOL IDK how you would do the first book or even touch on that part of the books (because it makes them very very hard to suggest let alone reread) but once you got to the singularity bomb at the science space station deep in a dense asteroid field.... I wanna see that part. The emotions that the story creates in the characters is pretty primal and believable. Its an interesting story how each of the main characters goes through the same level of violation but in different ways

The Temeraire series by Naomi Novik.