It was a case that shocked the world. A 3-year-old abandoned in an Australian train station, her mother murdered in New Zealand and her father on the run in America.

In September 2007 a three-year-old girl was found abandoned at Melbourne's Southern Cross railway station.

Initially authorities were unable to verify her identity, so they gave her the nickname "Pumpkin" after the Pumpkin Patch branded clothing she was wearing.

But "Pumpkin" was actually Qian Xun Xue and her father Nai Yin Xue abandoned her after killing her mother back in New Zealand.

Simon Scott was the Detective Senior Sergeant in charge of the investigation that crossed three international borders.

Go to this episode on rnz.co.nz for more details