 Olive Martin (Quirke), a heavily overweight young woman is convicted of killing and butchering her mother and sister and sentenced to life imprisonment. However, when she is assigned to write a book about her life, author Rosalind Leigh (Goodall) begins to develop a relationship with Olive and is soon convinced of her innocence. With the help of restaurant owner and former policeman Hal Hawksley (Fulford), she sets out to prove it and undo what she sees as a miscarriage of justice. However, all is not what is seems.