Note: Credit to Reshma for wonderfully updating the first half of this episode (in blue). The rest is by yours truly. Please let me know of any errors if present.
Written Update: Bomb ka Rahasya
Scene 1
The episode begins with four friends coming out from a theatre after watching a movie. A guy says that the movie was interesting and so he would watch it again once the exams were over. They decide to go have an ice cream when they hear someone's scream. Finding the direction from which the sound came, they cross the road and find a woman lying dead there. Asserting that someone had killed her, they decide to call CID.
Scene 2
The team arrives (Duo! Haye.! ) and Purvi says that there's no other mark other than one on her stomach. So Daya confirms that the girl was killed with the knife. Abhijeet wonders what she was doing there alone at night. Duo asks them what exactly happened. A girl tells that as they were coming out after the movie, they heard the lady's scream and when they reached here she was lying dead. Duo again asks if they saw anyone running or anyone beside her at that time. But they deny seeing anyone. When they ask if they saw some other enigmatic stuff, a man comes forward and tells that he saw the lady panting and looking at a van in front of his tea stall. But the man says that he couldn't see the person inside it. Daya impatiently asks if he saw the car number but he didn't see. He tells that the car was white in colour. Purvi informs duo that she had found a ticket to Bandra. Abhijeet says that only by going to Bandra, they can find out about her. Abhijeet asks Sachin to send the corpse to the forensic lab.
Scene 3
Dr. Tarika who is examining an X-Ray shows it to Salunkhe who lets out a how's-it-possible sigh. Just then ACP and his team enter the lab and to their surprise Salunkhe tells that the girl had not been murdered but that she had committed suicide. Sachin asks how that could be possible and Salunkhe says that the way the knife has pierced her body seems like it's a suicide. Freddy asks how a girl can commit suicide like that in the middle of the road with no one noticing her. Sachin reminds ACP what the chaiwala had told them. From another X-Ray report, Dr. Salunkhe tells that she had had an operation on her leg which only some professional dancers do. Due to dancing, the weight of the body gets to the knees sometimes created problems. ACP tells his team to try getting information about her in all the dancing academies and also to find out near Bandra as someone or the other would have seen her.
Scene 4
Purvi and Daya are in pursuit of information. Rajat also informs that no one knows her there. They are sure that the lady was from somewhere nearby. They decide to find out. On enquiring, a rickshaw wala recognizes the lady and recounts the incident. He tells that the lady had hurriedly sat in his auto while he was eating lunch and offered him 500 Rs. He tells that he had left her at the market in the colony of SJ Road. Purvi says that there is an Sj Market there. The automan also tells them that once she had descended from his auto she had met a person who face he didn't see. But tells that the girl had been carrying a bag, which she wasn't having when she returned. Daya tells that her motive could be understood only if they go to SJ Colony.
Scene 5
Abhijeet, Sachin and Freddy arrive at a place where few juveniles are practicing for an annual day program. The girl there recognizes the lady as Sheena who was one of the best performers in their group and that she was to perform for the program. She says that they had tried so much to contact her but in vain. Freddy is puzzled as to why a dancer as she will commit suicide. The other two are shocked to hear the news.
(Continued by DemonStar)
Sheena's colleagues are shocked and inform Abhijeet sir that she was a sociable and nice person. When Abhijeet sir asks for Sheena's address, the girl tries to say something but is interrupted by the program manager; Sachin stops him and asks her to continue. She reveals that Sheena forgot her bag in the makeup room the other day. She takes the cops to the bag in question, and they hear a ticking noise coming from within. They open it, surf through the contents and are shocked to find a bomb inside.
Scene 6
The action switches to the SJ Market, where a blast has taken place; several injured or dead victims are seen being carried away by medical staff. Daya sir, Purvi and Rajat arrive and are shocked to find the place in smithereens. They meet the police force there (adds a nice authentic touch to the scene), who reveal that the bomb was of medium intensity and resulted in four deaths and some injuries. It had been placed in a bag in one of the shops there, and due to the crowd in the market it's hard to find out who did it. Daya sir asks for the remains of the bag and all photographs taken there. Rajat recalls what the rickshaw guy had said - the lady had entered the market with a bag but returned empty handed. He construes that this was the very bag in question. Purvi wonders why she committed suicide; Daya sir says they need to identify her. He receives a call from Abhijeet sir at this point.
Scene 7
Back at the dance program, Abhijeet sir has the entire area evacuated. Daya sir, Purvi and Rajat arrive and join their teammates; Abhijeet sir says that there's insufficient time to call the bomb squad, and it needs to be neutralized at once. He asks Daya sir and the others to leave as he proceeds to do the same, but they refuse to leave his side. Daya sir supports him. After several tense moments, he manages to successfully diffuse it.
Scene 8
In the car, Daya sir, Purvi and Rajat discuss why the lady had been doing all this. Purvi and Rajat reveal that the details provided by her at the dance school were all counterfeit. Daya sir says they need to find out about her identity and accomplices.
Scene 9
In the bureau, a shopkeeper tells ACP sir and Sachin that the lady in question had visited his jewelery shop in argument some guy, screamed about him not listening to her and then stormed out. Following this, the man received a call and was talking about getting to Heera in 10 minutes before leaving. ACP sir dismisses him and wonders what this Heera is. Sachin construes that the place is obviously close to the jewelery shop. Meanwhile, Purvi and Freddy sir observe photos of the market blast site and note that a man in a van had been clicking the CID team's photographs when they were investigating there. ACP sir recognizes him as a criminal named Raghu. Sachin wonders if this is the same white van the tea guy had told them about. ACP sir is surprised since Raghu is supposed to be in jail, and asks Sachin to find out about the same. Purvi suggests if it's some lookalike of Raghu, Freddy sir wonders what Raghu had to do with a professional dancer. Sachin is told that Raghu is still in jail; ACP sir construes that it's indeed a lookalike they're dealing with. He instructs them to contact Dhenchu and find out about this guy (ehhh...).
Scene 10
Daya sir, Purvi and Rajat meet Dhenchu and ask him about the Raghu lookalike. He assures that he'll find out about the guy.
Scene 11
Abhijeet sir, Freddy sir and Sachin arrive at one Heera apartments which is 10 minutes away from the jewelery shop. They question two women there, who recognize the lady as one Ruby who's been living with her husband and two kids in the building since a few days, and has been missing for a while. The cops enter Ruby's flat and find the place empty. They search it and Sachin finds a map of Mumbai with small sketches at various points. They note that the sketches are relevant to the same places where prior bombs had been planted. They narrow down the next potential blast site to the sketch of a camera, indicating that it's a filming location. Abhijeet sir says they need to find out what it is, and what Ruby had to do with it.
Scene 12
The scene switches to a lonely road where an action scene involving a car is being filmed. Abhijeet sir, Freddy sir and Sachin arrive; this was the site marked in the map. Sachin reveals that Ruby has had a second marriage with one Nitin, and her former husband is a stuntman named Arnav. At this point, the director refers to the car driver by this very name and Abhijeet sir realizes he's in danger. Before they can act, the filming goes wrong; the car is knocked off steep climb and explodes on the ledge below. With Arnav likely dead, Abhijeet sir says they need to find Nitin at once.
Scene 13
Daya sir, Pankaj and Dhenchu are seen waiting for Raghu's right hand man (couldn't get his name) in a dingy market. Eventually the guy arrives and they capture and interrogate him. He reveals that the guy they saw in the van is Raghu himself; he's actually managed to escape from jail and his lookalike younger brother Varun has taken his place there. Also, Raghu had wished to complete some unfinished task before he was arrested. Daya sir says that they need to find out what this task is.
Scene 14
ACP sir, Freddy sir, Purvi and Sachin wonder why Ruby is committing all these crimes. They suspect Nitin of having murdered Arnav. They examine the map taken from Ruby's house and notice another small sketch there, that of a train. ACP sir construes that Raghu might be planning to bomb a railway station or train.
Scene 15
Our duo, Purvi and Pankaj are seen in the Qualis; Purvi reveals that according to the sketch, one Bindupada (?) railway station is the next target. Abhijeet sir frets that it's extremely crowded, and confirms that the bomb squad and police force have been summoned. They arrive at the railway station, start searching and eventually Daya sir finds the bomb in a trash bin, the wiring spread out farther across the place. Daya sir sends Purvi to make an announcement and have the station evacuated at once. The bomb squad arrives and gets to work whil the duo and Pankaj aid in evacuating the station. Suddenly, a few armed thugs open fire on them from within the train. There's a battle; duo manage to sneak inside and capture them. Abhijeet sir forces his captive to divulge whose orders he's been following; the guy points to a car outside.
Scene 16
We see a guy inside the car informing his boss that the CID had thwarted his plans, and he'll meet them in an hour. He drives away; the CID follows him to a lonely building in a forest. They sneak in after him and Purvi points out Raghu sitting at the far end, with Ruby's husband and kids held captive nearby. Abhijeet sir recognizes the car guy as Amit, manager of the dance programme, and realizes why he'd tried to interrupt their questioning about the bag that day. An unidentified man there tells them to flee before the CID gets there, and take along their hostages as well. Before they can escape, the cops emerge and apprehend them. The unknown man turns out to be none other than Arnav, who had faked his death in the car accident. Daya sir hands him a tight SLAP. 
Scene 17
In the bureau, Arnav confesses that he kidnapped Nitin and the children upon being forced by Raghu, to whom he owed a monetary debt and who wanted to cause blasts in the city. Arnav wanted revenge for Ruby divorcing him, thus he kidnapped her family and forced her to plant bombs in the dance school and vegetable market. Amit was bribed by Arnav to make sure nobody found the bomb at the dance school. Arnav then forced Ruby to commit suicide so that the truth about their evil deeds never surfaced. ACP sir declares that the three of them shall be executed for their crimes. 
THE END
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