MUMBAI, April 10 -- The Pant Nagar police have booked four people, including a couple, for allegedly duping a senior citizen couple to the tune of Rs.2.07 crore by selling them a 2-BHK flat which was already mortgaged to a private bank. Without a permanent roof over their heads, the complainant couple, who are retired bank employees, have been living in a rented flat for the past 18 months....