'Sex sells', the old adage goes, but so too does death, especially when it involves a famous woman. And a famous female death is, so far as the tabloids are concerned, simply a final, tragic curtain call to a life of drama, sadness, flaws and desperation. But, says Amy Kean, Whitney Houston, Amy Winehouse, Sylvia Plath, Judy Garland... they were geniuses, and should be remembered as such.