It is what it claims to be, short stories about true crimes in Australia. Some are familiar (Beaumont) others are not. Some perpetrators are punished, others have disappeared into time (unfortunately). Some crimes I hadn't heard of, some of the stories a little convoluted (by their nature, or that Rule had more involvement with than the others? I'm unsure).
It won't change the world. Oh and interesting that the Easey Street murders have subsequently been solved (there is someone who has been extradited to Australia) and is not any of the potential subjects Rule suggests. We can all get it wrong, even the 'experts'. Truth can be stranger than fiction.