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 ...

It's the stuff of spy novels, except in this case it's the stuff of actual spycraft. A new exhibit opening in London features ...

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 covertly ...

LONDON (AP) — A desiccated 110-year-old lemon that played ... Mincemeat” and “Agent Zigzag.” But he said it still marks “a ...

Featuring declassified documents and objects from MI5's private collection, the exhibition marks the first time the ...

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

Official Secrets,' an exhibition unveiling espionage methods and equipment used by Britain's spy agency. MI5 director Ken ...

A shrivelled lemon at the centre of a First World War spy drama is among dozens of items throwing new light on the secret ...

But Muller’s cover was blown when an agent from Britain’s Secret Service Bureau — known today as MI5 — ran a flat iron over a letter he sent in 1915, causing the invisible lemon ink to show.