This is a historical thriller with a background story that is happening in 1900 and a parallel story with somewhat parallel characters happening in the present with Saikat and Shuvashini. I really loved that format. it made the plot more interesting. This skipping between timelines was actually well structured and formed to allow in certain things to take place in the past while they are searching for the stone in the present. That was really good. Even the descriptions were vivid and flowing to make us understand the setup in the past more clearly. My only problem was with the editing of the book. Plot like this would have found its way to the top of the bestselling list more easily. It has so much potential. Again, it has nothing to do with the author or the story and I would still recommend it.
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I also would like to clear something out about the passive role to Shuvashini. Even though she is a history student, she couldn't contribute much to the story. but Saikat who was not a history student knew more things than her which made Shuvashini's character look stupid in some places. If the author did it intentionally based on gender then it is absolutely wrong. but it didn't feel like that to me until someone mentioned about it. but what I could take from it was 'sometimes it's not the degree that will take you to many places but the curiosity to learn and know many things will'. And I saw this one that way. He was well read and actually curious about it so it obviously made his role more active than her (Again that's just my opinion).