The Metamorphosis

Recommending this well-known masterpiece by Franz Kafka.

It has often been claimed as one of the key works of short fiction of the 20th century and is widely studied in colleges and universities across the world. The story begins with a travelling salesman, Gregor Samsa, waking to find himself transformed into a monstrous insect-like creature. But, as Alex says, if you want to know the rest, you'll have to read it.