A secret Nazi plot to kill the ‘Big Three’

What would have happened if Josef Stalin, Winston Churchill and Franklin D Roosevelt had all been assassinated at the height of World War Two? Speaking with Elinor Evans, Brad Meltzer and Josh Mensch discuss the complex tale of a little-known Nazi plot to kill the ‘Big Three’ during the 1943 summit in Tehran – regarded by some as a close call that could have changed world history, and others as a murky Soviet scam to garner secret intelligence.

• Read more about the Yalta and Potsdam conferences