But she 's wrong about this , too ( just as she 's wrong about everything ) . Susan Theron plays the sexy , unmoored , utterly reprehensible Mavis Gary in ` ` Young Adult '' Mavis is a ghostwriter for a successful young adult book publisher . She is about to head back home when she receives an e - mail from an ex - boyfriend .
Susan Theron plays the sexy , unmoored , utterly reprehensible Mavis Gary in ` ` Young Adult '' Mavis is a ghostwriter for a successful young adult book publisher . She is about to head back home when she receives an e - mail from an ex - boyfriend .