WHEN Baptist College student Elaine Luk was invited to her colleague's birthday party she jumped at the chance and even persuaded her mother to let her stay the night. What she did not know was that she was to be the only guest and the ''party'' would be her last. Hon first started preparing for the fateful night four days before, when he reserved a room for his lover Phoebe Wong at the Royal Park Hotel, Sha Tin, and an adjoining room for himself. The ''birthday girl'', Wong, was first to arrive on July 24 last year, when she booked into room 1605 shortly after midday. Hon arrived later that afternoon with a video camera and booked into room 1603 which had an interconnecting door. Wong told police she had tricked Luk into going to the hotel after Hon told her he wanted sex with the student. He told her to make her drunk, administer chloroform and to page him when the girl had blacked out. Wong gave Luk, who was not used to drinking, various spirits before pouring an entire bottle of chloroform and some perfume over a towel which she placed over the girl's face. When Luk did not pass out she contacted Hon who told her to lie on top of the girl to render her unconscious. Hon then drove back to Tuen Mun, reappearing a while later with a second bottle of chloroform. But Wong could still only make the girl semi-conscious so Hon put the chloroform on her face. After filming the indecent assault, they discovered Luk had gone cold. Realising their sordid game had gone too far, the panic-stricken couple contacted the hotel to call an ambulance. At the hospital, the couple called Luk's family to say there had been an accident. Doctors said they believed Luk was already clinically brain dead, but ordered that artificial ventilation be continued overnight. Luk was certified dead on the afternoon of July 26.