Starring: Toby Stephens, Tom Hollander, Rupert Penry-Jones, Samuel West.

Directed by: Tim FywellAt Cambridge University in 1934, four young men are courted by Soviet agents and recruited into a world of covert intelligence and espionage. Fired by youthful idealism, passionately committed to social justice and to fighting fascism, they are bonded by friendship based on shared conviction and shared sacrifice. This is the story of Blunt, Burgess, Philby and Maclean, the most notorious double agents in British history.

The four became embroiled in obtaining and passing on vital information, betraying their country to fight the evils of fascism. Enigma secrets and atomic details are given to Russian contacts as the careers of the four take them to Vienna, New York, Washington and Moscow. During almost 20 years of counter-intelligence, despite their personal journeys, the four are bound by their beliefs and their secrets.

DVD Extras: Commentary by writer Peter Moffatt, director Tim Fywell and producer Mark Shivas.

This is the story of Blunt, Burgess, Philby and Maclean, the most notorious double agents in British history

crime, double agents