September 11 1978, Georgi Markov dies in hospital in Balham, South London. Markov was a Bulgarian journalist working for the BBC, having recently defected to the West earlier that year. He had developed a fear after something resembling an insect bite appeared on his thigh.

An autopsy found a small pellet in the area, most likely filled with ricin. Before he died Georgi told his wife that when he felt the 'bite', he was on Waterloo Bridge and a man behind him was picking up an umbrella.

Was Georgi assassinated for his defection by the Bulgarians or the KGB? And did they use a modified umbrella to do it?

One of the most famous Cold War murders gets the Mystery on the Rocks treatment, which basically means bickering about the size and shape of the bullet, arguing about a 69 joke and getting distracted about little Masud watching Last Action Hero...

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