Cady soon learns about "The Burn Book", an old journal of Regina's that is filled with rumors, secrets, and insults about other girls and some teachers at school. After finding about "The Burn Book" Janis devises a plan to get back at Regina. Initially, Cady doesn't carry out Janis' scheme for ethical reasons, claiming that she thinks Regina is a good friend. Meanwhile, Cady becomes attracted to Regina's ex-boyfriend, Aaron Samuels, and purposely fails math in order to have an excuse to talk to him. Regina finds out about Cady’s crush on Aaron and even volunteers to talk to him for her. But Regina jealously steals Aaron back at a Halloween party by kissing him in front of Cady. This spurs Cady to fully commit to Janis' plan to cut off Regina's "resources". This involves breaking Regina and Aaron up, tricking Regina into eating "Swedish nutrition bars" that actually make her gain weight, and turning Regina's fellow Plastics against her. In the process, Cady unwittingly remakes herself in Regina's image, becoming spiteful and superficial, and abandons Janis and Damian.