September 1978, exiled Bulgarian dissident Georgi Markov is murdered in broad daylight on Waterloo Bridge, London with a poison-tipped umbrella. It would become the most infamous unsolved killing of the Cold War. Many years later, journalist Ulrik Skotte is approached with explosive new information about a man alleged to be responsible for Markov’s death, a spy code-named Piccadilly who worked for the Bulgarian secret service. This one meeting would launch Skotte into a hunt for the killer lasting more than a quarter of a century, bringing him face-to-face with eccentric conspiracy theorists, a washed-up former dictator, ageing Danish spooks & ultimately, with Agent Piccadilly himself. Drawing on an incredible cache of original documents, interviews and archive material, The Umbrella Murder provides jaw-dropping answers to a question that has persisted for nearly five decades- who killed Georgi Markov? And who has been protecting the assassin ever since?