Five years ago, Olive Martin pleaded guilty to killing and dismembering her sister and her mother, earning herself the chilling nickname 'The Sculptress'. Journalist Rosalind Lee needs to write a best-selling book and Olive is the perfect subject. Nothing has prepared her for her meeting with the obese killer and Rosalind is drawn into a strange relationship of manipulation and mutual trust. Despite Olive's protestations of guilty, Rosalind is convinced that she is hiding something - perhaps even her innocence. But if Olive didn't commit the murders, who is she protecting and why?