Well, my answer is, none other than LILA.
The story is that, Lila was a smart woman and she couldn't take it that she was in troubled relationships all the while and one such relationship had given her the virus. Her conscience wouldn't let her suffer to death. She wouldn't let somebody kill her. Not without paying back. So the party was a pre-planned one for the proceedings she would do, so that everybody would be present there, then made everybody go to her room, so that no one could escape saying that they din't go to the room at all, so couldn't have killed her.
The 'strong' tea she offered the author was actually for herself. She knew he wouldn't drink it because it reminded him of poison.It was made from the same tea leaves that she had kept from the author's house. Lila had given Sia somethin as a parting gift, telling that she would die in a few days due to virus and she wanted Sia to keep that as a memoir of her twin. Sia was sweet and not smart. So she couldn't understand the actual intention of this. Lila didn't want anybody to leave until the police arrived so asked everybody to stay when they were ready to leave.
She had taken the rosary from R saying that it would help her keep focussed during her last days of life. He , who believed women were divine had given it to her. When she actually drank the tea, she experienced discomfort. The porcelain cup had dropped off her hand. She went to drink water, but jar was empty. She had kept ther hand over the arm band next to the jar, trying to hold on to something, so got mangled. Then she went to the bathroom because she felt like puking, and there the rosary in her hand had ripped off.The scarf was from the accident that M had tried to get her into.The police would examine the tea. Once they found it poisoned, they would suspect the author because he had poisoned her earlier.The mangled arm band would make police catch Sia because they carried identical arm-bands. It was the pendant with the bullet that R had tried to kill her with, that was missing from her cabinet.Lila had given Sia the bullet pendant as the parting gift. When the police would search as to what is missing from the cabinet, Sia would show that to the police and say that the twins loved each other and she hadn't killed Lila. But, the police wouldn't believe that love existed between the two because, everybody knew that they had once tried to even drown each other and would inturn say that Sia had stolen it from Lila.G was anyways in trouble because it was known that theirs had been a public spat – he’d cheated on her in the open and in a weird twist, or maybe she wouldn't mind sparing him because she felt some sympathy that he would also eventually die of the same virus and was suffering the same now.
So, the 'Smart' Lila had got everybody into it, in a very 'Democratic' way.
The best clue for the answer is : In the clue given in the terms and conditions. Lila is the only name there and that's the answer(big clue) to the mystery :) Confirmed :)
Hope I have explained it sufficiently. Feels really good to have solved it.
Chandana C. Shekar
