The ice axe that was used to assassinate Leon Trotsky is perhaps one of the most famous murder weapons in history, currently on display at the International Spy Museum in Washington DC. But, what was the extraordinary story that led to the fateful moment when it was used back in Mexico City in 1940?

Joining Seán to discuss is Josh Ireland, author of the new book ‘The Death of Trotsky: the True Story of the Plot to Kill Stalin’s Greatest Enemy’...