Who Is the Mastermind?

Did Nitin poison the midday meal at the school? The technical team is on toes searching for Ristazone purchase across Mumbai. Sharad faces CBI inquiry for his fake encounter suspension. There is someone who is ready to backstab Amitabh and his Unit 9191 in disclosing the location of Jamaal and Sunaina. Who is the mole within the team who has BETRAYED the Unit?