His book, "Kill the Wanderer" is the most authentic and detailed investigation into the murder of the writer, Georgi Markov, by the Bulgarian State Security Service in London in 1978. The work is based on documents from a large number of secret archives.
Over the period of six years while working on the book, Hristo Hristov initiated and won an unprecedented number of court cases against the Minister of the Interior and the Director of the National Intelligence Service. They were both convicted by the Supreme Administrative Court for their refusal to provide access to the most important documents relating to the murder in the Bulgarian archives. After the court rulings access to the documents was granted to Hristo Hristov.
The revelations in the book have been quoted by a wide range of authoritative media agencies such as Reuters, Associated Press, The Sunday Times and many others.