Perhaps the world does not need another sociopath/mean girl story, but this novel transcended the genre for me, going through great pains to show a chain of plausible events that gradually blew out of control. The story gains gravitas by not limiting itself to the children. For while immaturity is the spark, the fuel for this fire comes from the grownups. The girls in many cases are simply copying the vanity, classism, and greed of their elders. It's makes for grim, but compelling reading. The shocking reveal is perfectly unfolded.