He had the perfect cover: he was an American citizen.

On the night of November 26, 2008, 10 men armed with guns and grenades launched an assault on Mumbai with a military precision that killed 166...a Pakistani militant group associated with Pakistan's ISI was responsible. And American citizen David Coleman Headley had been casing the city for two years, developing a blueprint for terror. FRONTLINE and ProPublica reporter Sebastian Rotella team up to investigate the mysterious circumstances behind Headley's rise from heroin dealer and U.S. government informant to master plotter of the 2008 attack on Mumbai...9pm