This second book in Stephen King's Dark Tower series suffers very seriously from clearly being a book in a series. The book feels very unfinished, which rankled me--much as it did with the Green Mile series, which I had to give up on and wait until the finished product was released as one book.
The plot continues the story of Roland the Gunslinger, fighting through a post-apocalyptic wasteland trying to reach "The Dark Tower". In this part, he slips through doorways into other worlds, where he recruits (willingly or not) three compatriots to share his journey. I really liked Eddie Dean, a heroin addict from 1980s New York City. His character is interesting and entertaining, as well as providing an excellent contrast to Roland. The other two new characters are not as successful, though they definitely add something new to the story.
Stephen King's writing style is--as always--very enjoyable to me, though I know there are people who find him overly verbose. If you don't like his style in other books, you probably won't like him here, either.
On the whole, I enjoyed reading the book, though was extremely frustrated that I have to wait until I can get the third book to find out what happens next.