The Class Project: How To Kill a Mother

the long version

"The Class Project investigates the incredible murder of a mother by her two teenaged daughters. Author Bob Mitchell details the murder trial and provides a troubling look at the youth culture that not only supported the two sisters but encouraged them to commit the crime and then revel in their secret for almost a year. Through interviews with witnesses, Mitchell reveals the world in which the girls lived, exploring the social and psychological elements that influenced their actions.' -- Amazon.com.