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I told Varys I was giving the princess to the Greyjoys. I told Littlefinger that I planned to wed her to Robin Arryn. I told no one that I was offering her to the Dornish, no one but you.

—Tyrion Lannister, Game of Thrones

Someone is a spy. But how to find them? This trope is about one solution. Tell multiple people different, but similar lies, and then see how the person the spy works for reacts. It may be worth noting that doing this doesn't inherently prove that the information leak is the work of an active spy - maybe they just have Loose Lips, and their spouse is the actual spy or something. In fiction, however, usually the leaker is a spy.

The Other Wiki calls this a "canary trap", after Tom Clancy's use of that term in his novel Patriot Games.

Compare Impostor-Exposing Test.

Examples of Different Lies To Find The Spy include:

(Some entries here were copied from w:Canary_trap#In popular culture.)

Fan Works

In A Young Girl's Delinquency Record, Jenny runs ran a small ring of drug dealers, and told Stevie that Dr. Brinkmeyer was the ring's supplier, but also told an unnamed redhead of a different unspecified supplier; it's safe to assume that more people were told different sources as the ring's supplier. After she accuses Stevie of telling the police who the ring's supplier is, Stevie makes a run for it. Jenny interprets the running as a confirmation that Stevie was an informant for the police (instead of there being a coincidence). When Jenny gets home, her knuckles are bloody.

Film

A variation of the canary trap was used in the film Miami Vice, with various rendezvous dates leaked to different groups.
In the film The Heat starring Melissa McCarthy and Sandra Bullock, a canary trap is employed by a drug ring to decide the loyalty of a returning member who is detective Mullins' brother.

Literature

The canary trap was used in several of Tom Clancy's novels. Chronologically it first appears in Without Remorse, when a CIA official alters a report given to a senator, revealing an internal leak who was giving information to the KGB. Different versions of the report were given to other suspected leakers.
This trap was also used in Robert Littel's book The Company, and later in the TV miniseries with same name.
The technique also appeared in Irving Wallace's book The Word (1972), and in the 1985 spy novel London Match by Len Deighton.
In Han Solo at Stars' End, the first book in The Han Solo Adventures, the title character uses a canary trap to find a traitor and murderer among his passengers. He tells each that their target is a different planet, all false, knowing that the traitor would have learned the real destination when they killed the group's leader.

Live-Action TV

Tyrion Lannister determined that Pycelle works for Cersei this way in Game of Thrones, as shown in the page quote.
- In addition to the example that provides the page quote, this plotline is also depicted in "What Is Dead May Never Die", during the second season of Game of Thrones.
The technique was used in the 1970s BBC television serial 1990.
In the third-season finale of The Mentalist, the characters use a canary trap (giving different hotel room numbers to different suspects) to uncover a mole within their agency.
A similar ruse to the one used in The Mentalist is used in the TV series Ashes to Ashes.

Web Comics

Girl Genius has Gil successfully catching one spy for a group trying to capture or kill Tarvek this way here.

Web Original

Done in Fenspace during the "Boskone War", in order to root out which group in the allies was leaking secrets to the enemy. Each group was told to rendezvous at a different location; when the enemy forces showed up early at one location to ambush the allies, the allies knew where the leak was.

Western Animation

In the Bob's Burgers episode "Tina Tailor Soldier Spy", Tina Belcher told different girls in her scout troop where a lead was for a place to sell cookies to find out which of them was spying for Troop 257.

Real Life

Who leaked the spoiler that Spock was going to die in Star Trek II: The Wrath of Khan? Thanks to somebody making sure each script had a unique code - in essence, something different was told to each person involved - we know that it was Gene Roddenberry himself.
The Electronic Frontier Foundation asks, with good reason, "Is Your Printer Spying On You?"
When distributing the film Broken to friends, Trent Reznor claims that he watermarked the tapes with dropouts at certain points so that he could identify if a leak would surface.

@@ Line 1: / Line 1: @@
-{{trope}}
+{{trope|wppage=canary trap}}
+{{quote|I told Varys I was giving the princess to the Greyjoys. I told Littlefinger that I planned to wed her to Robin Arryn. I told no one that I was offering her to the Dornish, no one but you.
-{{trope workshop}}
+|Tyrion Lannister|[[Game of Thrones]]}}
-{{tropestub}}
-{{quote|'''Jenny:''' Undercover cops started nosing around old Dr. Brinkmeyer. I think they were lookin' to see if he was part o' that terrible racket o' fake prescriptions for weed that we all been hearing about.
-'''[[Nominal Importance| Girl]]:''' But Brinkmeyer's not the one handing them out is he Jenny? You told me -
-'''Jenny:''' Yes, told you different. And I told you to keep quiet about it. In fact, I told exactly one of you the name Brinkmeyer, and that person was supposed to keep mum about it too. Ain't that right, Stevie?|A Young Girl's Delinquency Record}}  Someone is a spy. But how to find them? This trope is about one solution. Tell multiple people different related similar lies, and then see how the person the spy works for reacts.
-<code><nowiki>Describe the trope here, using more than one paragraph. Remove this line when you place a description on the page.</nowiki></code>
+Someone is a spy. But how to find them? This trope is about one solution. Tell multiple people different, but similar lies, and then see how the person the spy works for reacts. It may be worth noting that doing this doesn't inherently prove that the information leak is the work of an active spy - maybe they just have [[Loose Lips]], and their spouse is the actual spy or something. In fiction, however, usually the leaker is a spy.
-{{examples}}
-<!-- Please keep all of the section headers on the page until everybody agrees that the trope is ready to launch. -->
-== [[Advertising]] ==
+[[The Other Wiki]] calls this a "[[w:canary trap|canary trap]]", after [[Tom Clancy]]'s use of that term in his novel ''[[Patriot Games]]''.
-== [[Anime]] and [[Manga]] ==
+Compare [[Impostor-Exposing Test]].
-== [[Comic Books]] ==
+{{examples}}
+''(Some entries here were copied from [[w:Canary_trap#In popular culture]].)''
 == [[Fan Works]] ==
+* In ''[[A Young Girl's Delinquency Record]]'', Jenny runs ran a small ring of drug dealers, and told Stevie that Dr. Brinkmeyer was the ring's supplier, but also told [[Nominal Importance|an unnamed]] redhead of a different unspecified supplier; it's safe to assume that more people were told different sources as the ring's supplier. After she accuses Stevie of telling the police who the ring's supplier is, Stevie makes a run for it. Jenny interprets the running as a confirmation that Stevie was an informant for the police (instead of there being a coincidence). When Jenny gets home, her knuckles are bloody.
-* Jenny does this in ''A Young Girl's Delinquency Record''.
 == [[Film]] ==
+* A variation of the canary trap was used in the film ''[[Miami Vice (film)|Miami Vice]]'', with various rendezvous dates leaked to different groups.
+* In the film ''[[The Heat (film)|The Heat]]'' starring Melissa McCarthy and Sandra Bullock, a [[canary trap]] is employed by a drug ring to decide the loyalty of a returning member who is detective Mullins' brother.
 == [[Literature]] ==
+* The canary trap was used in several of [[Tom Clancy]]'s novels. Chronologically it first appears in ''[[Without Remorse]]'', when a CIA official alters a report given to a senator, revealing an internal leak who was giving information to the [[KGB]]. Different versions of the report were given to other suspected leakers.
+* This trap was also used in Robert Littel's book ''[[The Company (Littell novel)|The Company]]'', and later in the TV miniseries with same name.
+* The technique also appeared in [[Irving Wallace]]'s book ''[[The Word (novel)|The Word]]'' (1972), and in the 1985 [[spy novel]] ''[[London Match]]'' by [[Len Deighton]].
+* In ''Han Solo at Stars' End'', the first book in ''[[The Han Solo Adventures]]'', the title character uses a canary trap to find a traitor and murderer among his passengers. He tells each that their target is a different planet, all false, knowing that the traitor would have learned the real destination when they killed the group's leader.
 == [[Live-Action TV]] ==
-* Tyrion Lannister determined that Pycelle works for Cersei this way in ''[[Game of Thrones]]''
+* Tyrion Lannister determined that Pycelle works for Cersei this way in ''[[Game of Thrones]]'', as shown in the page quote.
+** In addition to the example that provides the page quote, this plotline is also depicted in "What Is Dead May Never Die", during the second season of ''Game of Thrones''.
+* The technique was used in the 1970s BBC television serial ''[[1990 (TV series)|1990]]''.
-== [[Music]] ==
+* In the third-season finale of ''[[The Mentalist]]'', the characters use a canary trap (giving different hotel room numbers to different suspects) to uncover a [[mole]] within their agency.
+* A similar ruse to the one used in ''The Mentalist'' is used in the TV series ''[[Ashes to Ashes]]''.
-== [[New Media]] ==
-<!-- Note: Both Web Original and New Media are for works that originated online. The distinction is that New Media works allow for feedback and audience participation - if a work doesn't allow for this, then it's a Web Original, not New Media. -->
-== [[Newspaper Comics]] ==
-== [[Oral Tradition]], [[Folklore]], Myths and Legends ==
-== [[Pinball]] ==
-== [[Podcast]]s ==
-== [[Professional Wrestling]] ==
-== [[Puppet Shows]] ==
-== [[Radio]] ==
-== [[Recorded and Stand Up Comedy]] ==
-== [[Tabletop Games]] ==
-== [[Theatre]] ==
-== [[Video Games]] ==
-== [[Visual Novel]]s ==
-== [[Web Animation]] ==
 == [[Web Comics]] ==
+* ''[[Girl Genius]]'' has Gil successfully catching one spy for a group trying to capture or kill Tarvek this way [https://www.girlgeniusonline.com/comic.php?date=20160314 here].
 == [[Web Original]] ==
 <!-- Note: Both Web Original and New Media are for works that originated online. The distinction is that New Media works allow for feedback and audience participation - if a work doesn't allow for this, then it's a Web Original, not New Media. -->
+* Done in ''[[Fenspace]]'' during the "Boskone War", in order to root out which group in the allies was leaking secrets to the enemy. Each group was told to rendezvous at a different location; when the enemy forces showed up early at one location to ambush the allies, the allies knew where the leak was.
 == [[Western Animation]] ==
-* Tina Belcher did this in the ''[[Bob’s Burgers]]'' episode Tina Tailor Soldier Spy
+* In the ''[[Bob's Burgers]]'' episode "Tina Tailor Soldier Spy", Tina Belcher told different girls in her scout troop where a lead was for a place to sell cookies to find out which of them was spying for Troop 257.
-== Other Media ==
 == [[Real Life]] ==
+* Who leaked the spoiler that {{spoiler|Spock was going to die}} in ''[[Star Trek II: The Wrath of Khan]]''? Thanks to somebody making sure each script had a unique code - in essence, something different was told to each person involved - [https://www.cinemablend.com/news/2495482/star-trek-ii-spoilers-the-bizarre-story-about-leaked-scripts-nervous-studios-and-a-clever-solution we know] that it was {{spoiler|[[Gene Roddenberry]] himself}}.
+* The Electronic Frontier Foundation asks, with good reason, "[https://www.eff.org/issues/printers Is Your Printer Spying On You?]"
+* When distributing the film ''[[Broken (1993 film)|Broken]]'' to friends, [[Trent Reznor]] claims that he watermarked the tapes with dropouts at certain points so that he could identify if a leak would surface.
 {{reflist}}
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 [[Category:{{PAGENAME}}]]
 [[Category:Pages Original to All The Tropes]]
-[[Category:Pages needing more categories]]
 [[Category:Espionage Tropes]]
+[[Category:Gambit Index]]
-{{DEFAULTSORT:{{PAGENAME}}}} <!-- If the page name starts with "A", "An", "The" or a punctuation mark, replace "{{PAGENAME}}" with a version of the name without them here. DEFAULTSORT should be the very last thing on the page if it's used at all. -->