As per CBI, Dr. Talwar is involved. Dr. Talwar has been doing or done some illegal activity. Krishna & group have been blackmailing Dr. Talwar and his wife (may be including Durranis). These people totally submissive whatever krishna says. Talwar and nupur may be drug addict, they might be under the influence of those drugs (Shambu is the drug supplier). Once the couple was under the influence of the drug, these guys started boozing.. the rest is known
