here was a muslim family who had come to the railway station and they were going home for the feast of eid, a big day on the muslim calendar. they had been gunned down by these fanatics of an ideology that had nothing to do with the religion of the victims. i felt this was a very core thing for me to get. i said to mohammed, could we bring some more of your family to speak to us? he said yes, there is a 19- year-old boy who will come. one thing or another happened, and it was not a 19-year-old boy who came, it was a 12-year- old boy who came, accompanied by another member of the family. i thought my god, 12-year-old kids, in london, 12-year-old kids have problems talking about personal things and expressing themselves. this kid was amazing. we found a little shed that we were loaned by local community association. we set up on the floor and i could barely hear his words. he was just incredible. for me he was the heart and soul. >> how many days did you spend total in mumbai? >> with the research and filming together, it took three months, over three months. most of that time would have bee