Franz Kafka is considered to be one of the 20th century’s most important writers.
His significant works (all of which are modern classics) include:
The Complete Short Stories
The Trial is a novel, and it is a story of paranoid anti-bureaucracy. It was made into a film by Orson Welles.
The Castle is also a novel and is another story of paranoid anti-bureaucracy.
Amerika is also a novel that is a study in paranoia, but it is told in an uncharacteristically comedic style.
In many ways, although it is a serious novel, Amerika is also a comedy.
Of the short stories, Metamorphosis is probably the most important. It was adapted into a powerful play by Steven Berkoff.
After that, The Burrow, In the Penal Colony, A Hunger Artist, Description of a Struggle, and The Great Wall of China, are all worth reading.
There are also many letters, several essays and two diaries that are also interesting reading.
Franz Kafka is now considered to be one of the 20th century’s most important and significant writers.
If you haven’t read Kafka, try The Trial and Metamorphosis first, and then try any of the others.