This is a collection containing 25 of this great horror writer's stories, though not all of them are horror. King has a good line in psychological thriller stories too, and there's plenty of that in here!
Two of the stories feature the world of Salem's Lot, in fact the book opens with Jerusalem's Lot, a story set in the 19th century, kind of a Salem's Lot begins, and is very good!
There's also The Lawnmower Man, a 1975 story that bears no relation to the 90s sci fi flick! It is pretty much Stephen King doing horror, quite creepy and more than a bit weird!
Overall a good collection with a nice long introduction by the author.