At just after 1pm on Thursday August 28, a 14-year-old school girl left her home to walk along the canalside in Hanwell. She hasn't been seen since.
In the four weeks since she vanished there has been a dramatic turn of events with the subsequent disappearance from the same area of a convicted murderer form Latvia.
Arnis Zalkalns, 41, is now being treated as a prime suspect in the investigation surrounding Alice.
Alice Gross, a Brentside High School pupil, talented singer and anorexia sufferer is still missing. There is no physical evidence to suggest she has come to any harm.
Mr Zalkalns was reported missing a week after Alice Gross. It took the police a further nine days to question his partner and an additional three days to publicly draw any parallels with his disappearance and Alice's.
Police have come under fire for their painfully slow response in connecting the disappearance of the wife killer with the missing school girl.
Due to EU European treaty rights and Britain's open boarders Mr Zalkalns was free to enter the country with no questions asked.
There has been a public outcry over the fact that a convicted killer was able to make a home in Britain completely unhindered, unchecked and unmonitered.
Timeline of events:
28 August: The 14-year-old schoolgirl left home in Hanwell, west London, at 1pm. The last sighting of her on CCTV is at 4.26pm on a bridge over the Grand Union Canal, heading in the direction of her home.
3 September: Convicted murderer Arnis Zalkalns, 41, last seen at home in Ealing, where he lives with his partner and child.
4 September: Mr Zalkalns, a builder from Latvia, failed to meet a friend and bike to work with him - Zalkalns, who rides a red Trek mountain bike, would always cycle along the Grand Union Canal to work on a building site in Isleworth. Police announce they have found CCTV footage of Alice Gross along the Grand Union Canal including Brentford Lock.
5 September: Mr Zalkalns is reported missing to police by his partner, from his home in Ealing
11 September: Police say two builders found Alice's bag in undergrowth near the canal the day after she went missing. It contained the trainers she was wearing when she left her house, underwear, and rubbish from her packed lunch. Police ask for help in finding Alice' white iPhone, last used the day she disappeared to send her father a text.
Alice Gross's family, friends and community rally together to organise a yellow ribbon day to mark two weeks since her disappearance. At this point volunteers have distributed over 10,000 missing Alice posters across London.
Also on this day, detectives said they wanted to trace another missing person, Arnis Zalkalns, who they said travelled to work along the same canal where Alice went missing. A detective said: 'It is completely out of character for Arnis to go missing. His family is very worried about him. I am asking for anyone who has seen him, or knows where he is to get in touch.'
18 September: Police said they were now treating Mr Zalkalns, whom they said had a murder conviction in his native Latvia, as a suspect. It is also revealed that the Latvian killed his wife and buried her in a shallow grave in woodland in Latvia.
19 September: A £20,000 reward is offered for anyone who gives the police information that leads them to find Alice.
Met police issue a statement saying they are in the process of obtaining an International Letter of Request - the first step towards asking Latvian police for the full file on Zalkalns.
They also say there is still no European arrest warrant out for him.
20/21 September: British detectives finally approach the Latvian authorities for assistance in the search for Zalkalns.
23 September: Police divers continue their search of the river near Alice's home in west London.