A 110-year-old lemon that played a key role in espionage history is one of the star attractions of a London exhibition drawn ...
From invisible ink in lemons to Cold War betrayals, MI5’s first public exhibition reveals spy stories and gadgets spanning ...
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 ...
Featuring declassified documents and objects from MI5's private collection, the exhibition marks the first time the ...
And the words “case file” are written across the middle of the folder. In black ink. This is my only remnant of the Hutte Detective Agency, the only trace of my passage in that old three-room ...