Letters From the Inside is a young adult novel written by Australian author John Marsden.

It appears to Mandy that Tracey's life is perfect, as she has a wonderful boyfriend, rich and caring parents, and she is close to her siblings.

Mandy refuses to give up, and finally Tracey replies with the information that she is in fact in a juvenile detention center, and will be there for a long time.

Towards the end of the book, Tracey finally confesses the truth about her family and gives her reason for not wanting to hear about Mandy's brother.

Anita Silvey of Horn Book Magazine in her review of Letters from the Inside wrote: "John Marsden writes another riveting story of young women with much to say and much to escape from.