In an age of near-constant surveillance, where our every move can be monitored, a 13-year-old girl began walking to school and vanished without a trace.
Not for just one day. It's been two-and-a-half years.
A Victoria Police task force has come up with essentially nothing but an abduction theory on the whereabouts of Siriyakorn "Bung" Siriboon, last seen on June 2, 2011.
There are no suspects. No new sightings. No major leads.
It is the kind of disappearance that is frightening and baffling, even for veteran detectives.
"It goes to the heart of all of us," said Detective Inspector John Potter, head of the state's homicide squad.
"You would think it would be unheard of in our society, yet it's happened."
A $1 million reward, announced on Tuesday, is the latest bid to flush out a possible accomplice or someone who's been told what happened and kept it secret.
Police say anyone who comes forward today and reveals who is behind the disappearance in Melbourne won't be prosecuted, even if they were involved.
Bung's stepfather Fred Pattison says life has been on hold for the family and he hopes the reward will be a breakthrough.
"As far as we're concerned we have no new information than we had nearly two-and-a-half years ago," he said.
"It's hard to believe that someone can just vanish off the face of the earth."
Bung was a shy teenager who wouldn't have gotten into someone's car willingly, he said.
But nobody saw her being pulled into a stranger's vehicle on a busy suburban street during peak morning traffic.
Bung left her mobile phone at home when she walked out the door and headed to school about 8.30am (AEST) that day.
A neighbour three doors down from her Elsie Street home in Boronia, in the city's outer east, saw the schoolgirl walk by in uniform and carrying her school bag.
The walk should have taken her about 10 minutes but she never arrived.
A secondary sighting on Harcourt Road at 8.55am (AEST), placing Bung within 130 metres Boronia Heights College, has been discounted, leaving the neighbour as the last known person who saw Bung alive.
Taskforce Puma, set up four months after Bung's disappearance, interviewed hundreds of people before being shut down last year as the tips dried up.
More than 1000 homes were door-knocked and at least 1200 leads closely examined.
Bung doesn't appear in CCTV footage in the area. No clues were left on her social media accounts.
Police concluded Bung didn't orchestrate her disappearance and her family, along with everyone she knew, was cleared of involvement.
Hundreds of registered sex offenders have been questioned.
A handful of them remain "persons of interest" because their alibis cannot be corroborated.
But one of the best leads emerged and faded last year with no thought to the abduction and murder theory.
A 24-year-old man told police he accidentally struck Bung while driving by.
He said he panicked and dumped her body in nearby parkland.
A five-day search of Old Joe's Creek retarding basin at Boronia in August 2013 failed to find her body.
The man was questioned again and released without charge.
Det Insp Potter said the man's story was questionable.
"Some things he's told us don't add up," he said.
What's left is a renewed appeal to convince someone with a conscience - or an appetite for $1 million - to pick up the phone.
"There are more victims than just the family," Det Insp Potter said.
"There's the neighbours. There's schoolfriends and the wider school population. All of them want answers."
Bung's stepfather agrees.
"Think if it was your family or your daughter," he said.
