The Metamorphosis - Franz Kafka

The Metamorphosis (in German, Die Verwandlung, "The Transformation") is a novella by Franz Kafka, first published in 1915, and arguably the most famous of his works along with the longer works The Trial and The Castle. The story begins with a traveling salesman, Gregor Samsa, waking to find himself transformed into a giant "monstrous vermin". (Summary from Wikipedia)