How the world’s greatest public health organization was brought to its knees by a virus, the president and the capitulation of its own leaders, causing damage that could last much longer than the coronavirus.

Behind the scenes, a small team of FBI agents spent years trying to solve a stubborn mystery — whether officials from Saudi Arabia, one of Washington’s closest allies, were involved in the worst terror attack in U.S. history. This is their story.

What we know (and don’t), more than a year after American diplomats began to suffer strange, concussion-like symptoms in Cuba.

A California martial arts instructor’s secret past.

Previously: Finding Oscar

A man living in the Boston suburbs learns he could be one of the only survivors of a 1982 massacre in Guatemala.

An investigation into Lashkar-i-Taiba, the group behind the 2008 Mumbai massacre, and why Pakistani authorities has not arrested their leaders.