Missing teenager Leah Croucher lied to her parents about where she went on Valentine's night, police leading the search for her have revealed.
The 19-year-old disappeared the following day, on February 15, on her way to work in Milton Keynes. Her mobile phone and bank account have not been used since.
Today, nearly four months after she was last seen, police revealed Leah had left her family home between 6pm and 7.15pm on Valentine's Day, telling her parents she was going to visit a friend.
Inquiries have since shown that was not the case and detectives are now trying to work out where she went during those 75 minutes.
The last-confirmed sighting of Leah was on Buzzacott Lane in Furzton just after 8.15am on February 15.
Three witnesses have reported seeing a woman, who could have been Leah, by Furzton Lake in Milton Keynes between 9.30am and 11.15am the same day. They said she looked "angry, upset and crying".
Police think it is possible Leah may have disabled the location settings on her mobile phone during a walk by the lake the evening before.
Since her disappearance, detectives have visited more than 4,000 homes in the town, examined 1,500 hours of CCTV, spoken to 100 potential witnesses, and taken reports of more than 200 potential sightings of the teenager.
Last week her brother Haydon Croucher, 23, appeared in court accused of making threats to a man called Adnan Choudhury, who he described as Leah's ex-boyfriend. It was decided that it was not in the public interest to pursue the prosecution and he accepted a voluntary restraining order.
Anyone with information relating to Leah's disappearance should contact Thames Valley Police.