Long-time BBC security correspondent Gordon Corera recently published a new book, Russians Among Us: Sleeper Cells, Ghost Stories and the Hunt for Putin’s Spies.   

The book explores the explosive story of Russia’s espionage efforts against the United States and the West and provides riveting details about ten Russian sleeper agents who were arrested in the U.S. in 2010 and were subsequently swapped for four people held in Russia.

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