I like all 3 lord of the rings
Through the eyes of the dragon and 11/22/63 by King
Watchers and twighlight eyes by Koontz
We seem to have similar tastes lol the ones in bold I'm a huge fan of...
To OP:
I've broken my recommendations down into half-assed categories
Horror/sci-fi horror
I really dont dig on King as much as most, at least his whole novels, he gets pretty dry for me for some reason, I love his short stories and a few of his novels, and want to try a lot more of them. I grew up reading Dean Koontz and love TONS of his stuff, but especially:
Twilight Eyes: A story set in the 1960's carnival scene about a psychic boy on the run who can see some people aren't what they seem.
Dragon Tears: Partner detectives and others hunt down a telekinetic foe who attacks them with amazing and inventive means.
The Frankenstein Series: A modern sequel kind of to mary shelly's masterpiece.
The Taking: (creepiest book I ever read) about either an alien invasion or the end of the world...or both..
Intensity: A girl finds herself locked in a serial killer's RV without him being aware...very tense book
Odd Thomas series: Young adult sees ghosts "but then does something about it" great series that was turned into a pretty ok movie as well. (series loses it's way at the end a little, but the first ones are home runs and the rest worth reading to see where Koontz goes with it)
Sci-Fi/Fantasy
The Expanse: Probably my favorite sci-fi at the moment, is now a pretty good series on the syfy network, but the books are incredible. space drama/horror at its finest imo
The Dark Elf Series: kinda like Lord of the Rings if it was fast moving and funnier. Drizzt is one of the iconic D&D fantasy type characters and his story is pretty great. R.A. Salvatore wrote them and he is great.
The Half Orcs by David Dalglish: one of my favorite series that is pretty much unknown. the characters are not black and white and do some terrible things, but you still pull for them and want them to do well. It's about a pair of half-orc twins.
Darth Bane Trilogy and Thrawn series: If you like Star Wars at all read these books, they're fantastic.
Wool: A series of short novels about live in an underground silo after the apocolypse. Great, fast reads.
Year of the Rogue Dragon Trilogy by Richard Lee Byers- If you like dragons, this books got tons of em lol and other fun characters too
Eragon series: I know they're a little juvenile, but I liked them. Movie was a disaster.
Classics (old books)
Frankenstein by Mary Shelly or Dracula by Bram Stoker or Invisible Man by H.G. Wells ( I just love classic horror)
Lord of the Flies by William Golding- A plane full of british school boys crashes leaving them alone on an island and tells how they create their own little society.
Fahrenheit 451 by Ray Bradbury- in a future where books are banned and burned and houses are fire-proof, firemen's new job is to find books and burn them. Main character, Guy Montag is one such fireman.
I Am Legend by Richard Matheson- The birthplace of all zombie stories imo, no movie has still got it right, including the reason the book is named what it is. Great fast read.
Slaughterhouse Five: Great, classic book...can't really describe it lol, it's weird.
Starship Troopers by Robert Heinlein
Action/Adventure/other
Jack Reacher series: Someone already mentioned em, but they really are fast paced, exciting reads.
Fight Club by Chuck Palahniuk- Almost a cliche suggestion, but it really is fantastic. Some of Palahniuks other stuff is great as well.
Fear and Loathing in Las Vegas by Hunter S. Thompson: Actually anything by Thompson, but this is the go-to.
Norse Mythology by Neil Gaimon Norse mythological stories organized in short story, book fashion, and its fantastic. STory of Odin losing his eye, Thor getting his hammer, or course ragnarok, everything in between.
Non-Fiction
Killing Lincoln, Kennedy, Jesus, books by BIll O'reilly. I know a lot of people don't care for his show or politics, but these books are incredibly well researched and give a lot of context and character to the people killed who became so big we sometimes forget they were people. Really enjoyed these.
Going Clear by Lawrence Wright: A fantastic, in depth history of L. Ron Hubbard an Scientology and then the cult itself. Enthralling read.
Donnie Brasco by Joe Pistone: Undercover agent in the mob.
Under and Alone by Bill King: Undercover Agent in an OMC.
Good Clean Fun by Nick Offerman: Part good advice, part woodworking plans, part hilarity, good stuff from Offerman (ive enjoyed all of his books actually)
That's all I got off the top of my head...Also have a TON of comic recommendations if you want em. I may edit this as I think of more, this was fun lol