This feature documentary tells the story of Diane Charron, a young woman who began a life sentence behind bars in 1981 when she was entangled in a friend's act of revenge and ended up stabbing a stranger to death. She had just turned 19. The film follows the story of Diane's life, from her own testimony and that of corrections officers, prison caseworkers and psychiatrists. Many show remarkable sympathy and affection for a troubled woman whose early life was marked by abuse. Sentenced to life is a strong film that raises difficult questions about prisoners with mental health problems.