Here's the general plot: A man named K. wanders into a village governed by officials in a castle not far away. He checks into an inn, goes to sleep, and is awakened by the innkeeper and one of those officials, who says he doesn't have permission to stay in the village and that he must leave immediately. K. claims to be a land-surveyor summoned by the castle (we never really learn whether he is or not, but I assume he's lying), and after some phone calls, he is allowed to stay. So he sleeps. The next morning, he tries to contact various officials, but he finds it impossible. He thinks he has a chance at talking to an official who knows an official, etc, etc, etc, but, of course, he doesn't. It's the same general idea as The Trial , though they're certainly two different novels. And then it breaks off. The end.
It doesn't sound like it, but I really do like Kafka. I read The Metamorphosis when I was in high school, and I really enjoyed it. I read The Trial when I was in college and, for a while, thought it was the best novel I'd ever read. The Castle was okay. Next time, I'll read one Kafka finished writing.