Following Ivan Milat’s arrest, police officers started searching the home he shared with his sister, Shirley. Among the items seized was this book, Violent Crimes that Shocked a Nation – Unsolved by Australian author and former Daily Mirror reporter, Anthony Barnao. The book was published in 1985 and is now out of print.
The Canberra Times article from November 2, 1994 as well as author of the book Highway to Nowhere, Richard Shears mistakenly named the book Violent Crimes that Rocked a Nation – Unsolved.
I couldn’t find a description of the book but going by the title it’s obviously about unsolved crimes in Australia.