For a pure, unadulterated blast of classic King horror, it's hard to beat 'Christine'. Sentient, evil car? Check. 1950s nostalgia as a corrupting force? Check. A slow takeover of the protagonist's best friend? Check. It's straightforward, viciously fun, and doesn't get bogged down. It's also a great look at his themes of addiction and obsession, wrapped in a greasy, motor-oil-scented package. If you want a pulpy, addictive page-turner that embodies his 80s era, start your engines here.
Ultimately, there is no single right answer. His career is too long, his range too wide. A recommendation is just handing someone a key to a specific door in a vast, creepy, wonderful mansion. The best you can do is listen to what they like in other stories and point them to the door that seems to fit their key. They might just wander through the whole place after that.
Lisey's Story' is a deeply personal love story wrapped in a horror-fantasy. It's about grief, memory, and the secret language of a long marriage. The horror elements—the Bool, the long boy—are bizarre and terrifying, but they're metaphors for emotional trauma. It's not a conventional scare-fest. It's a challenging but beautiful book that many consider his most autobiographical. I'd only recommend it as a starter if the person is more interested in profound relationships than in traditional plot-driven horror.
His collaboration with his son Owen, 'Sleeping Beauties', is a fascinating modern take on a gender-based pandemic where women become wrapped in cocoons. It's a big, ambitious novel with a large cast and strong social commentary.
It reads like a blend of King's classic small-town ensemble style with a more contemporary, co-written sensibility. It's a good option if you want to see how his storytelling translates to a very modern premise and a collaborative process.