Warning: the following contains graphic details of violence and sexual assault that may be triggering for some readers.
Around 9:12pm on Sunday, February 9, 1986, general duties police officer Deborah Wallace, 26, boarded a train at Sydney's Central station, bound for the western Sydney suburb of Blacktown.
She wasn't in uniform; just a pair of ballet flats, leggings and a white sleeveless top cinched at the waist with a wide belt.
The outfit was almost exactly that worn by another 26-year-old woman who'd taken the journey a week prior: Anita Cobby.
The day Australia lost its innocence.
Anita had vanished after a night out with friends in inner Sydney on February 2.
Two days later, Anita's body was found in a paddock in the nearby suburb of Prospect. She'd been badly beaten, repeatedly raped, and her throat slit.
It's often said that Australia lost its innocence when that news hit the headlines. A nurse, a former beauty queen, snatched from suburban streets and savagely murdered.