[[quoteright:200:[[WesternAnimation/AmericanDad http://static.tvtropes.org/pmwiki/pub/images/hayley_hippie_or_piemaker_2109.jpg]]]]
[[caption-width-right:200:[-By day, outspoken GranolaGirl. By night, [[SupremeChef award winning piemaker]].-] ]]

->New friends I have made are fascinated with the international intrigue associated with my father's line of work. However I let them know that life with a spy was as normal as theirs except that their fathers planed corporate strategies while mine planned embassy break-ins, assisted defectors and their families seeking asylum, and created counterintelligence strategies. Pretty normal stuff as I saw it.
-->-- ''Spies Wives: Stories of CIA Families Abroad'' by Karen L. Chiao and Mariellen B. O'Brien

Any character secretly living another life (or even more than that) can be a very powerful plot device in fiction, allowing for any number of stories. What kind of life is being led normally? What kind of life is being led secretly? Will the secret life be revealed? If not, how will it be avoided? If it is revealed, how soon in the story, and what are the repercussions?

And this is TruthInTelevision, where reveals of such lives make up quite a number of scandalous tales.

Compare DoubleConsciousness.

!!A SuperTrope to:
[[index]]

* DeepCoverAgent
* TheMasquerade (whole groups of people living two lives)
* NaughtyByNight
* RichIdiotWithNoDayJob
* SecretIdentity (and all its {{Sub trope}}s)
* SeeminglyWholesomeFiftiesGirl
* TripleShifter (don't they sleep?)

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!!Examples That Don't Fit In The Sub Tropes:
* ''WesternAnimation/AmericanDad'' had many forms of this.
** Roger became a master of this when he took up frequent disguising, to the point where the show found many ways to play with this.
** As on the picture, Hayley turned out to be an award winning cook, dressing up like a [[TheFifties 1950s housewife]] despite her far left wing views.
* Neo from ''Film/TheMatrix'' leads a double life as a regular white collar worker Thomas Anderson and an infamous hacker of international renown.
* Angel in ''Angel'' ([[SimilarlyNamedWorks no relation to]] Angel in ''Series/{{Angel}}''). Schoolgirl by day, hooker by night.
* The narrator of the song [[http://www.youtube.com/watch?v=ZLiVeRJTtqo "Junk Food Junkie"]]
-->In the daytime I'm Mr. Natural
-->Just as healthy as I can be
-->But at night I'm a Junk Food Junkie
-->Good Lord, have pity on me
* Sharon from the ''VideoGame/StreetFighterEX'' series works as a nun by day, dutifully and painstakingly making it her mission to take care of orphans living at the monastery where she was raised. At night, however, she moonlights as [[ColdSniper a cool and collected]] highly-ranked secret agent usually employed by an unknown intelligence group to carry out [[ProfessionalKiller assassinations]].
* Paulo Thiago is a UFC welterweight fighter who initially was noticed for an underdog victory by knockout in his UFC debut against perennial contender Josh Koscheck... however, his legend took off in the US when it was revealed that his day job is being a member of the Brazilian capital's military police special operations battalion -- aka [[TheEliteSquad BOPE]].
** He's a member of the unit in Brasilia, ''not'' the unit in Rio de Janeiro on which the book and movie were based, but the distinction is usually lost in the US, which the UFC has never tried to correct -- in fact, at UFC 134: Rio his entrance music was the ''Elite Squad'' theme song, complete with the (Brazilian) crowd singing it.
* ActionPet Perry the Platypus in ''WesternAnimation/PhineasAndFerb'' acts like a normal pet around his family, but is actually a {{badass}} secret agent.
* In ''Manga/TokyoGhoul'', some Ghouls choose to establish human identities and live as humans. The staff of Anteiku balance running a Coffee Shop by day with being the peacekeepers of the 20th Ward by night, while several characters struggle to balance an active school life with their night-time activities of protecting their territories and satisfying their HorrorHunger for human flesh. Then there's a major ChekhovsGunman of the series, [[spoiler: author Takatsuki Sen, who balances her life as a famous novelist with being the leader of Aogiri Tree]].
* In {{TOME}}, [[spoiler:Zetto and Kirbopher are really the same character using different accounts. While Kirbopher is a main character and a friend to the other members of the main cast who cares about nothing more than having fun, Zetto is the co-leader of the hackers, and is obsessed with finding and wiping out the Forbidden Power.]]
* ''Manga/DontBecomeAnOtakuShinozakiSan'' feels like she's in this situation. On the one hand, she befriends otaku Kaede and Micchy with the intent of "saving" them from Otaku life. On the other, she was previously a LovableAlphaBitch in middle school. She tries to keep her growing otaku side hidden from everyone who isn't Kaede, Micchy, and their own friends. Akina "feels like" this because she eventually realizes, to her horror, that the ''only'' person in her class who thought Akina wasn't an otaku was Akina herself.
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