Kim Jong Un’s half brother was working for the CIA. That may explain why the North Korean leader had nerve agent-wielding assassins murder Kim Jong Nam in a Malaysian airport, but it leaves open a number of other questions. The Daily Beast got a copy of Anna Fifield’s blockbuster new biography of Kim Jong Un that has the CIA scoop. So who was Kim Jong Nam talking to? Did Kim Jong Un know? And why did North Korea want him dead?