With Fairport Convention and solo, Sandy Denny displayed one of contemporary music's finest voices; she also composed her own material, including "Who Knows Where The Time Goes"--a huge U.S. hit for Judy Collins--and sang on Led Zeppelin IV.

However, Sandy tragically got caught in a spiral of drink and drugs and died at age 31 in 1978.

Best-selling Dylan biographer Heylin draws on hours of new interviews to tell Sandy's story.