Read the story in Indonesian languageWhen the film Vina: Before Seven Days was released in Indonesia, it was difficult to find good reviews.
The movie follows the true story of the death and gang rape of a young woman.
There was criticism of the violent scenes and the filmmakers' choice to tell it in the horror genre — the most popular in Indonesia.
Some reviewers found it to be insensitive to Vina and her family, who are main characters in the story.
Despite the initial response, after three weeks in cinemas the film has been seen almost 6 million times, making it the second-most watched in Indonesia this year.
It has also put pressure on police to track down the main suspects long wanted in connection with Vina's killing.
The feature is adapted from the true story of Vina Dewi Arsita and her boyfriend, Rizky Rudiana (Eky).
They were killed on August 27, 2016, in what police initially told their families was a traffic accident.
"Our family believed it because it came from the police," Vina's sister Marliana said.
But they also held lingering doubts.
Marliana said Vina's motorbike and mobile phone were still intact — which the family found unusual given she had supposedly been in a deadly crash.
On the third day after Vina's death, things took a turn.
A true story with a pinch of the supernatural
Early in the morning, Marliana was phoned by the brother of one of Vina's friends.
He told her "your sister's spirit entered into my sister's body", so Marliana went with her father to the friend's house to find out what was going on.
"[The friend who was possessed by] Vina's spirit told us everything about what happened, she said 'don't be fooled by the police, it wasn't an accident … I was raped, killed, tortured, hit by wooden block'," said Marliana, who recorded the allegedly possessed voice.
On the recording a name was also mentioned.
It was the nickname of a man, also known as Pegi Setiawan, who belonged to a local motorbike gang.
Marliana took the strange recording, Vina's mobile phone and other evidence to police, who then re-investigated the case as a murder rather than a traffic accident.
"Not long after that, I got news that the perpetrators were arrested," Marliana said.
Police also had further evidence including some of the suspects' motorbikes, phones and clothes as well as some rocks and bits of bamboo, according to court documents seen by the ABC.
The three missing suspects
Police arrested eight out of 11 suspects — all members of the same gang to which Mr Setiawan belonged.
In May 2017, they were found guilty of gang raping Vina and the premeditated murders of her and Eky.
Seven were sentenced to life imprisonment, while a minor was sentenced to eight years in prison.
But for the next seven years the other three suspects, including Mr Setiawan, remained at large.
Things suddenly started moving again when the film hit cinemas.
A week after it went to air, the family was told the investigation had been transferred from the local police in Cirebon where the murders happened to the larger force of the West Java Regional Police.
And after another week, police finally tracked down and arrested Mr Setiawan.
Police continue to search for the two other suspects but are sceptical they may not exist and could have been invented as scapegoats.
Arrest under public pressure
When presented by the police at a press conference last month, Mr Setiawan interrupted the official giving a statement.
"Permission to speak," Mr Setiawan said.
"The suspect will [speak] later at the court hearing," commissioner Jules Abraham Abast said.
"I never committed the murder, this is slander … I am willing to die to prove that I am innocent," Mr Setiawan said and continued repeating while being led away.
Mr Setiawan's lawyer told the ABC his client was not in Cirebon when Vina and Eky were murdered.
"Pegi's parents and his colleagues know that Pegi was in Bandung at the time of the incident, and they will give testimony," Toni, Mr Setiawan's lawyer said.
Lovina, a researcher from the Institute for Criminal Justice Reform in Jakarta who goes by one name, said she was worried about the consequences of the extraordinary public pressure that the film and social media had put on Vina's case.
She said she was concerned it may result in investigations that were not thorough and lead to wrongful arrests.
"There are advantages where social media can be a tool for us to monitor public policy, but it's important to note that law enforcement officers should not work on viral-based policies like this … instead, they must follow the procedures," she told the ABC.
"Because the police wanted to prove their performance to the public, [I am worried] they ended up carrying out law enforcement processes carelessly."
West Java Regional Police's director of general crimes, senior commissioner Surawan, said he was certain Mr Setiawan was the mastermind of the murders.
Surawan said police had difficulty tracking him down because he regularly moved between Cirebon and Bandung, a city 140 kilometres away, and used a fake name.
"We have examined key witnesses at the scene of the incident, and also confiscated evidence of Mr Setiawan's motorbike registration and ID during a search of his house in Cirebon," he said.
Vina's sister, Marliana, said her family had been traumatised by some posts on social media.
Some people believe Mr Setiawan has been wrongfully arrested, she said.
"They blame my family. How does my family have anything to do with it?"
"[It's] a police matter."
Marliana said her family's only hope was for the case to be solved and justice carried out.
