When a heavyset girl discovers that whatever she does to her body physically affects her bully, she has to decide how far she's willing to go to exact revenge.

After returning home from being admitted to the psych hospital, Casey (Emily Kirk) realizes that the event that pushed her over will never see justice. When contemplating her suicide, she is offered a strange opportunity to seek her own Vengeance against the girl that has wronged her, but how far can a self-serving poison really take you?