Kissa Anjaan Aawazon Ka: Part 1 - S1.E3

The Police find an abandoned dead body and immediately become suspicious. They react quickly and hand the case over to the CID. Initial investigation helps them identify the victim and trace his residence and family members. During a thorough search of his room, ACP Pradyuman and his team find a box full of audio cassettes, with random recordings. What could these recordings be? Does one of these cassettes have the information required to nab the culprit?