In 1976, the US Senate ordered a fresh inquiry into the assassination of John F Kennedy, who was murdered in 1963 during a motorcade in Dallas, Texas. People who had been involved in the original Warren Commission investigations were asked to make fresh statements. The FBI and the CIA were persuaded to release more of their documents on Oswald. New lines of inquiry were opened and individuals who had not previously given evidence were persuaded to come forward. Most important of all, pieces of evidence such as photos and sound recordings were ....