Revelle Sabine Balmain (11 July 1972 – c. 5 November 1994) was an Australian model, dancer and escort who mysteriously disappeared from the Sydney suburb of Kingsford in early November 1994.^[1] Balmain has never been heard from since.

Balmain was planning to visit Japan for her fourth six-week tour of cabarets, employed as a hostess. She had been working as a part-time model and as an escort to establish herself, and she was planning to finish escort work so that she could fully concentrate on her entertainment career.^[2]

On 5 November 1994, Balmain, who was living in Sydney, had arranged to meet her mother at Newcastle Station for lunch.^[3] She did not arrive on the train as expected. At 4:00 pm the same day, Balmain, who worked as an escort under the name of "Mischa", visited a client in the south-eastern Sydney suburb of Kingsford.

After the two-hour appointment was over, she had planned to meet her friend, Kate Brentnall, for a drink. At 7:15 pm, Balmain rang Brentnall to say that she was about to leave her client and suggested that they meet at the Royal Hotel, Paddington. She did not keep that appointment.^[2]

On the following day, 5 November, Balmain's bag, make-up, diary, credit cards, and keys to her Bellevue Hill flat were found scattered around several Kingsford streets. One of her shell-studded platform shoes was retrieved from one street; the other shoe was found in another street.^[2]

Police interviewed Balmain's client, who said that he had driven her to the nearby Red Tomato Inn at about 7.00 pm on the evening of 5 November. As the booking was from 4.00 to 6.00, it was unclear if Balmain had moonlighted for the additional hour.^[3] Police officers also questioned the escort agency's owners, but the enquiries resulted in no charges being laid.^[2]

After a couple of fruitless weeks of searching, the New South Wales government offered a reward of $100,000 for anyone who could provide information that would lead to the arrest of Balmain's killer.^[2] As of 14 May 2021, the reward stood at $1,000,000.^[4][5]

In May 1999, the Deputy State Coroner, John Abernethy, handed down an open finding into Balmain's presumed death.^{[citation needed]} The coronial inquiry, however, suggested that the final client she had visited that day was a primary suspect, but fell short of recommending charges.^[6]

Items belonging to Balmain, including her keys, passport, and plane ticket were also found in the vicinity of her final client's^[who?] residence.^[3] In 2008, forensic evidence suggested that Balmain was murdered in her final client's house. Members of Balmain's family also believe that there were major flaws in the police investigation of the disappearance.^[7]

• List of people who disappeared