Forgotten!

I hate it when I try so hard to remember the name of someone or something (song/ movie/ book/ place) and my memory fails me. I have been trying to remember the name of a book I had read few years ago. It had a teenage Indian girl as the main protagonist who was born in a slum/brothel of Calcutta (or was it Mumbai?) and was then adopted by a young and kind British lady. She had a short name like Mira or Radha or Gita. The story was quite interesting and in the end the girl ends up murdering the British lady's boyfriend (or probably husband?) accidentally. Also, the girl had some Afghani/Arabian connection. The book was not by an Indian author as far as I remember.

I want to buy that book, but I have no clue what its name was!! Sigh, age is finally catching up with me :(

image courtesy: http://www.democracycellproject.net/