A Tree Grows in Brooklyn is a 1943 semi-autobiographical novel written by Betty Smith. The story focuses on an impoverished but aspirational adolescent girl and her Irish-American family living in Williamsburg, Brooklyn, New York City, during the first two decades of the 20th century. The main metaphor of the book is the hardy Tree of Heaven, whose persistent ability to grow and flourish even in the inner city mirrors the protagonist's desire to better herself.