A 110-year-old lemon used by a German WW1 spy to send secret messages from Britain with invisible ink is going on display in ...

A collection of never-before-seen files, photographs and items from MI5's own archives are going on display for the first ...

The lemon, now black and shriveled, helped convict Karl Muller, a German spy in Britain during World War I. It was found by police in his dressing-table drawer, along with another in his overcoat ...

A battered leather briefcase left behind by Guy Burgess when he fled to Moscow in 1951 is among 20 objects from MI5's ...

It’s a classic line from a spy movie: “Burn after reading.” For German agent Karl Muller, that advice would have really helped. Muller, a spy who masqueraded as a Russian shipbroker and ...

The intelligence agency’s exhibition at London’s National Archives delves into Britain’s history of spying and includes a 110 ...

Many stories told in the exhibition, however, would not be out of place in a thriller. The lemon, now black and shriveled, ...