: for seven weeks, razim heard nothing more about his son. then, suddenly, the boy was returned. he was terribly ill. he died two days later. >> next timfrontline... >> mumbai has been hit, and hit hard. >> david coleman headley was a specialist in constructing a blueprint of the killing zone. >> a dream come true from the perspective of a terrorist group. >> a sociopath, evil... >> a u.s. double agent... >> did they ask him about his work for the u.s. government? >> we were told by the u.s. that is not to be asked. >> "a perfect terrorist," a frontline/propublica investigation. >> frontline continues online. learn more about the opium brides problem and the politics of poppy eradication. watch frontline's other undercover reports inside afghanistan, and hear from a prominent former u.s. official about why he believes drone strikes in pakistan may be counterproductive. >> in a sense, we have helped to bring about the situation that we most fear. >> follofrontlion facebook and twitter, or join the discussion at pbs.org/frontline. >> frontline