Doodledog
OldFrill
Anniebach
I understand that, is the book about the murders or her life leading to and after
From the reviews it seems to be about her life and why she murdered, the book is a supposedly a useful investigation into why she murdered. It's called "Cries Unheard" of you want to look it up. It's reviewed 3.88 out of 5 on Goodreads if you use that.
Cries Unheard was not written by Mary Bell. It was written by Gitta Sereny, who has written widely about murderers and victims, including in the Third Reich. It's a disturbing but interesting read, and came out decades ago. My copy includes an essay about the Bulger case, which is also very interesting, and outlines the upbringing of the killers and both their behaviour and that of their parents in court.
I'm not sure that Bell benefited from the book, but to be fair it's many years since I read it.
I think l was clear that Mary Bell was paid to collaborate with the author and didn't write it herself. The book was mentioned due to the furore over Mary Bell receiving payment for it (£50,000 l believe in the 1990s). Sereny also wrote a book about the trial.
