Nina Gilden Seavey was twelve on May 5, 1970, the day an Air Force building in St. Louis burned to the ground. Her dad represented a young man accused of the crime: Howard Mechanic. Facing serious federal time, Howard went on the run and became one of the longest-running fugitives in U.S. history. As an adult, Nina picked up the trail. Whatever happened to Howard Mechanic?

This eight-part series is the tangled story of her search for answers. Hundreds of Freedom of Information requests. Hundreds of thousands of pages of documents. FBI surveillance and confidential informants. Cold War spies, conspiracy theories and the murder of a civil rights icon. And the sacrifices America makes in the name of national security.