New biographies examine the troubled psyche of Sylvia Plath on the 50th anniversary of her death

“American Isis: The Life and Art of Sylvia Plath” by Carl Rollyson (St. Martin’s Press, 319 pages, $29.99)  “Mad Girl’s Love Song: Sylvia Plath and Life Before Ted” by Andrew Wilson (Scribner, 368 pages, $30)Read more