The controversies that surround Sylvia Plath's life and work imply that her poems are more read and studied now than ever before. This Companion provides a comprehensive and authoritative overview of the place in twentieth-century culture of Sylvia Plath's poetry, prose, letters and journals. The newly commissioned essays by leading international scholars represent a spectrum of critical perspectives. They pay particular attention to key debates and to well-known texts such as The Bell Jar, while offering original and thought-provoking readings to new as well as more seasoned Plath readers.