While fleeing their Mali stronghold, al-Qaida left behind documents describing not how to terrorize a population, but how to govern.
An investigation into the ill-fated text messaging platform ZunZuneo.
What the CIA really knew about Robert Levinson, a retired FBI agent who disappeared in 2007.
An 88-year-old woman is taken from her Wisconsin farmhouse. Inside the investigation to find her.
Israel Keyes confessed to multiple murders, but committed suicide before revealing all the details.