Hello everyone. Need help with a thriller novel I am writing with India as the prime location.

I am writing a novel that has an Indian setting. I am from India but I have read many books from foreign authors and not much from Indian authors. I would have chosen to write the novel with the setting from other country but I am afraid I'd write something about that country wrongly based on my research and assumptions. So, I have chosen the Indian setting.

Now, the novel starts with a guy's suicide. (It's not really a suicide, but an attempted murder, that will be revealed later). Since I haven't read many Indian novels, I am not sure who would investigate this guy's suicide. I know the local police will look into the matter first, but I don't know if they hand over the case to detectives or do the investigation on their own.

This is really important because one of the four main protagonists should be a cop/detective who investigates this case. Kindly advise me on what to do and if you know similar story novels do share me those novel names, so I can derive some inspiration.

Also, can you guys let me know how you describe the environment of your stories? I guess I have poor visualization ability so I don't know how to describe an imaginary or fictional environment. I just couldn't conjure how a certain location would look like in my mind. Any tips or advice for the same is appreciated. Thanks for taking your time and helping me out!