Mumbai Restaurant: Indian spy investigation series crime thriller novel

Pakistan's spy agency ISI operates under the cover of a private hospital in Apbara, Islamabad. From the outside it looks like a private hospital. They are carrying out various destructive activities by joining Lashkar-e-Toiba to act against India. One of them is the promotion of fake Indian currency made by Pakistan. How are such currencies distributed in India? Who are its agents in Kerala? The Indian spy organization 'R&AW' is unraveling the chain of serious crimes. Mumbai Restaurant is a book in that series of novels.