Rakshak is a popular mystery, thriller, and detective novel written by Sushanta Singh Rajput. The story takes place in the city of Calcutta, India. The main character is Detective Bhaskar, a man who is investigating different cases in an attempt to solve them. He is also a part of the investigation team led by Inspector General of Police Satbarshit.

Inspector General Satbarshit is investigating a case of murder and he needs Detective Bhaskar's help in order to solve the case. Detective Bhaskar has to go to different places in the city to find out the cause of death and the murderer. He has to look for clues and evidence at the places.