Summary Byomkesh marries Satyavati (Sukanya Kulkarni) and Byomkesh, Ajit and Satya start living in the same house. One day Byomkesh is fascinated by news that a noted high society thief Ramanath Niyogi (Kumar Shirazi) has been released from jail. He gets news that the PA Harihar of Maharaja Ramendra Sinha (Prem Rishi) has been murdered and Byomkesh is called for investigations.

Maharaja Ramendra believed in rehabilitating known criminals. Harihar approached Ramendra 6 months ago & had served jail time several times in his last 30 yrs. He had just been released from an 8-year jail term for theft and robbery. He was released one year early due to his good conduct during imprisonment.

Harihar wanted to reform himself and hence approach Ramendra, due to the latter's reputation. Ramendra employed Harihar & soon promoted him to his PA, as he was becoming indispensable to his affairs. Harihan was first murdered by a knife to the chest and then his throat was slashed. Ramendra recollects that Harihar was acting very scared a couple days before his death. In one of his town meetings, one poor man approach Ramendra for help & Harihar got very scared just by looking at the man.

Byomkesh recollects that a Lal Neelam was stolen from Ramendra 8 years ago and he had announced a reward of Rs 5000, if returned. Ramendra says that Harihar had also inquired about the same award a few months ago.

Byomkesh declares that Ramanath Niyogi is the killer. Ramanath had stolen the Lal Neelam from Ramendra 8 years ago and was jailed. Ramanath was a noted thief in high society circles & had thefts of more than Rs 4 lakhs credited to him. His eyes were on the Rs 25 L worth jewelry collection of Ramendra. Ramanath found an opportunity to steal the entire collection, which contained a Lal Neelam, which Ramendra considered his most prized possession & the source of his good luck. Byomkesh says that Neelam's have a unique effect on every person, and the same stone can be auspicious for some and destructive for others. Ramendra announced an award of Rs 5000 for the same. Ramanath was caught & the jewelry recovered, but not the Neelam.

Byomkesh is convinced that Ramanath holds the key to the case. He has Ramanath arrested & his house searched but doesn't find the Neelam. Byomkesh theorizes that Ramanath was captivated by the Neelam. When caught 8 years ago, he took the Neelam to jail with him & managed to keep it hidden from jail authorities. But Byomkesh convinces Ramanath that not all Neelam stones are conducive to everyone. This Neelam, while auspicious to Ramendra, had an opposite impact on Ramanath.

Harihar was in jail with Ramanath, & both became friends. Harihar helped Ramanath hide the Neelam. Harihar had developed a pocket in his neck, which he used to hide gems. Ramanath gave Harihar the Neelam to hide in there. Soon thereafter Hairhar is transferred to a different jail. Harihar betrays Ramanath by taking the Neelam with him.

After 8 years, when released, Harihar goes to Ramendra to return the Neelam in exchange for the Rs 5000 award. But before he could do that, Ramanath came into the house, killed Harihar & cut his throat to retrieve the Neelam. Reluctantly, Ramanath gives up the Neelam & it is returned to Ramendra.

• Adventure
• Crime
• Mystery
• Thriller