Detective Omkar Nath (D.O.N.)

Imagine a kidnapper demanding ransom before the kidnapping, even giving a time and date for it. D.O.N faces a challenging case filled with twists involving an innocent 4-year-old, Gulla. His grandfather and parents receive a threatening call, making the intentions clear. It begins with Lala Radheyshyam Halwai from Bikaner, now a wealthy sweet manufacturer in Mumbai, who wants to return to Bikaner with his family. His grandson, Gulla, is his pride and joy. However, his son and daughter-in-law, born and raised in Mumbai, disagree. The family receives a note with Gulla's cut hair, demanding ransom or threatening to kidnap him. D.O.N is consulted, and the police are deployed, but the kidnapper still manages to abduct Gulla when Lala faints, and local ruffian Babban is captured with chloroform (a setup). Thomas, the driver, and Reshma, the nanny, are prime suspects as they have disappeared. D.O.N's investigation reveals a secret room in the mansion known only to three people.