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The killer – Lila killed Sia.

Reason for Conclusion – Few things before i start the conclusion. Lila was smart and she liked to spread her love around, so she will never commit suicide and also none of her ex-husband are capable enough to kill her.

Lila mentioned in the invitation that “she’d only a few years left to live and wanted to bury the past”. Her past was all her ex-husbands and her sister. She wanted all of them to suffer and avenge and life happily after that.

Lila killed Sia and then left all the evidences in the room so that all her ex-husbands would be in suspicion and their life will be ruined.  She didn’t left anything for “G” because she had already avenged her by dragging his name through mud.

When Lila met with everyone and Sia came in the last, Lila poisoned the coffee (which author “I”refused) and gave it to Sia and also gave her pendant as a parting gift to Sia in the bejewelled case. When everyone thought that Ria came out crying actually it was Lila but as she wasn’t wearing the pendant, so everyone thought that it was Sia. Also, When everyone thought that Lila came out withdrawn & anxious but actually it was Sia and she was in that condition because of the effect of poison. When they were leaving then Sia remembered that she forgot the case inside her sister room which was gifted by her sister, so she went back to take it and then poison killed her.

Also this is written “Sia did not have a motive any more. Among all of us, she escaped Lila earliest”. This will simply keep Lila out of all suspicion and she will live her life in peace after that because she had avenged herself.

Well, I tried my best to be Sherlock Holmes, let’s see how much i am successful in that. :)