rotella: ...who would only talk to me if i paid him. >> you've got to do something for me, sebastian. >> rotella i refused. >> nobody else knew headley the way i knew him. >> rotella: he introduced headley to mumbai's party scene. >> rotella: devon bharti is the commissioner of investigations for the mumbai police. >> after this place, they took a left turn. >> rotella: he questioned the people who knew headley, like his secretary. headley hired her for the mumbai office of the immigration company owned by his friend, rana.gu#? the business was here, but it was just a front. >> rotella: headley had succeeded on his first mission: insinuating himself in mumbai. >> you know, if you go through old bollywood films, there's always one white guy who is inflicting some vile hardship on poor peasants or, you know, innocent street pavement dwellers and stuff. and we all grew up with that, that one evil guy who always wore a suit and hung around at expensive hotels. david headley is that guy. >> rotella: the taj mahal palace, the five-star hotel built in 1903-- a symbol of india and western-style luxury.

the reporter is sebastian rotella. >> her anger lead to what happened next. she goes toz the u.s. embassy in islamabad and warns them about her husband's extremist activities just as the mumbai plot is gathering momentum, the reconnaissance and the preparation. >> that's right. they must have had a disagreement, she has a short fuse, she goes and mentioned that he was trained by to be, he's a... lashkar-e-tayyiba and he's a terrorist and nothing happens. >> reporter: perhaps most surprising, she revealed to u.s. embassy officials that she and headley had spent their honeymoon at the taj hotel the year before. in combination with her other charges, that could have led investigators directly to headley's work for lashkar. alarming and detailed am sagss were piling up. >> his wife says he's involved in something. you look at him for a week or month and you can't find anything interesting. there's 72 other active investigations going on in your office. i think people are too quick in all these cases when they look at the individual case and say "hey, you should have known when in fact

the reporter is sebastian rotella. >> her anger lead to what happened next. she goes toz the u.s.mbassy in islamabad and warns them about her husband's extremist activities just as the mumbai plot is gathering momentum, the reconnaissance and the preparation. >> that's right. they must have had a disagreement, she has a short fuse, she goes and mentioned that he was trained by to be, he's a... lashkar-e-tayyiba and he's a terrorist and nothing happens. >> reporter: perhaps most surprising, she revealed to u.s. embassy officials that she and headley had spent their honeymoon at the taj hotel the year before. in combination with her other charges, that could have led investigators directly to headley's work for lashkar. alarming and detailed am sagss were piling up. >> his wife says he's involved in something. you look at him for a week or month and you can't find anything interesting. there's 72 other active investigations going on in your office. i think people are too quick in all these cases when they look at the individual case and say "hey, you should have known when in fact,

read more from propublica reporter sebastian rotella about lashkar-e-taiba, the isi and headley. >> headley figured out every step of the attack. >> find out what a top indian investigator uncovered about the attacks. >> look, terrorists were given indian identity cards. >> learn about efforts to rebuild chabad house. follow frontline on facebook and twitter or tell us what you think at pbs.org. >> frontline is made possible by contributions to your pbs station from viewers like you. thank you. and by the corporation for public broadcasting. major funding is provided by the john d. and catherine t. macarthur foundation. committed to building a more just, verdant, and peaceful world. and by reva and david logan. committed to investigative journalism as the guardian of the public interest. additional funding is provided by the park foundation. dedicated to heightening public awareness of critical issues. and by the frontline journalism fund, supporting investigative reporting and enterprise journalism. >> for more on this and other frontline programs, visit our website at pbs.org. >> frontlin