Johann Wolfgang von Goethe 
Sorrows of Young Werther/Die Leiden des jungen Werther 

Loosely based on Goethe’s personal experiences, the novel is written mostly in the form of letters in which Werther recounts his unrequited love for a married woman. Its Sturm und Drang style, portraying the rebellion of youthful genius against conventional standards, makes it a perennial favorite with readers of every era.