The Bell Jar is the only novel written by the American writer and poet Sylvia Plath. Originally published under the pseudonym “Victoria Lucas” in 1963, the novel is semi-autobiographical, with the names of places and people changed. The book is often regarded as a roman à clef because the protagonist’s descent into mental illness parallels Plath’s own experiences with what may have been clinical depression or bipolar II disorder. Plath died by suicide a month after its first UK publication.