The Mystery of Poison - S1.E5

A high profile socialite takes refuge at a five star hotel before she can preside over a conference that is taking place the next day. The socialite named Sushma Uppan takes her green tea with a squeeze of lemon and later writes a letter. Next day, CIB officer Trisha gets a call about Sushma Uppal's death, which seems like a suicide and she is asked to rush to the hotel with her team.