Raising her five kids alone in a rundown section of Sacramento, Theresa Cross Knorr seemed like the ultimate survivor. But her youngest daughter, 16-year-old Terry, told police another story: one almost too terrible to believe. According to Terry, Theresa - no longer the petite brunette she once was - had turned insanely jealous of her pretty eldest daughters and enlisted the help of her two teenaged sons in a vicious campaign against their sisters...