"I was ten years old when I found a murder weapon...it had killed 'The Girl with the Opal Fingers'..."

Welsh Canadian professor of criminal psychology Cait Morgan, and her retired-cop husband Bud Anderson, are visiting Cait's sister, Siân, and brother-in-law, Todd, in Australia. They're enjoying the bustling delights of Sydney, and looking forward to a few quiet days in the famed Blue Mountains.

However, soon after it's revealed that Todd once worked closely with a man convicted of a brutal slaying, the decades-old murder casts a threatening shadow over the foursome. Cait and Bud must discover the truth behind that case, as well as understanding the complex reasons for an ever-growing number of deaths they fear might be associated with it, before tragedy can engulf Cait's family.

Packed with local color, and quirky, memorable characters, this thirteenth book in the series is certainly unlucky for some.

Will it prove to be the same for Cait and Bud...and for Cait's family?