Satyanweshi

সত্যান্বেষী is the third story written by Sharadindu Bandyopadhyay featuring the Bengali detective Byomkesh Bakshi and Ajit Bandyopadhyay but is considered first in the Byomkesh Series.

Plot
Cocaine Murders Case Ajit Bandyopadhyay lives in a hostel, along with some other people. Ashwini Babu and Ghanshyam Babu are two of the hostel inmates; they live next to Ajit. The hostel is run by a philanthropic homeopathic doctor, Anukul Babu. Ajit has recently become aware of some murders that have happened in their locality. They seemed to have been done by the same person, possibly a serial killer.

One morning a young man named Pratul Chandra Mitra comes to Anukul Babu, looking for a vacant room in the hostel. Anukul Babu informs him that there is no vacant room currently available in the hostel. Pratul Chandra Mitra sees Ajit sitting nearby and requests the latter to allow Pratul to share his room with him. Pratul even offers to pay the entire rent, if allowed to do so. Ajit accepts.

One night, Ashwini Babu is murdered and Pratul gets arrested. But after sometime he is released, without any explanation. That night the murderer of Ashwini Babu tries to kill Pratul and Ajit, but he fails. The real killer gets arrested, who is Anukul Babu. He has been doing the business of cocaine behind homeopathy. Ashwini Babu came upon the secret and thus had to be killed.

After that, it is revealed to Ajit that Pratul Chandra Mitra is really Byomkesh Bakshi who has assumed an alias to know the truth behind the chain of murders. Byomkesh takes Ajit to his home and they begin living together in the former's house with a servant, Punti Ram.

Radio

 * Sunday Suspense adapted this novel as radio drama, voiced by Mir Afsar Ali, RJ Deep and Richard.

Television

 * This was one of the stories of 1993 TV series Byomkesh Bakshi, that were recreated for broadcasting on Doordarshan, the Indian National Network, by Basu Chatterjee, and immediately went on to become one of the most memorable episodes.
 * The story adapted into another TV series in 2014 named Byomkesh, which aired on Bengali channel ETV Bangla.

Film

 * 2015 Hindi language film Detective Byomkesh Bakshy! is mainly based on this story.