The lemon, now black and shriveled, helped convict Karl Muller, a German spy in Britain during World War I. It was found by ...

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 ...

In 1915, a German spy was executed after he was caught with a lemon in his pocket. A new exhibit in the U.K. shows how he used it for espionage.

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

A 110-year-old lemon that played a key role in espionage history is one of the star attractions of a London exhibition drawn ...

LONDON — A desiccated 110-year-old lemon that played a key role in espionage history is one of the star attractions of a London exhibition drawn from the files of MI5, Britain’s domestic ...

LONDON (AP) — A desiccated 110-year-old lemon that played a key role in espionage history is one of the star attractions of a London exhibition drawn from the files of MI5, Britain’s domestic ...

The 110-year-old lemon has garnered significant attention from the MI5 exhibition organised in London. The lemon, which is ...

National Archives staff members look at facets of a recreation of the double cross operation room which was headed up by the XX committee circa 1944, during a preview for the MI5: Official Secrets ...