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Belgian author Misha Defonseca admitted that her bestselling memoir about surviving the Holocaust was in fact a literary forgery.

Misha Defonseca

Author of a fraudulent Holocaust memoir

Misha Defonseca is a Belgian-born impostor and the author of a fraudulent 1997 Holocaust memoir titled Misha: A Mémoire of the Holocaust Years, initially presented as true.
Source: Wikipedia (CC BY-SA)

Misha: A Mémoire of the Holocaust Years

Literary hoax

Misha: A Mémoire of the Holocaust Years is a literary hoax by Misha Defonseca, first published in 1997. The book was published as a memoir telling the claimed true story of how the author survived the Holocaust as a young Jewish girl, wandering Europe searching for her deported…
Source: Wikipedia (CC BY-SA)

Literary forgery

Literary work which is deliberately misattributed to a historical or invented author

Literary forgery is writing, such as a manuscript or a literary work, which is either deliberately misattributed to a historical or invented author, or is a purported memoir or other presumably nonfictional writing deceptively presented as true when, in fact, it presents untrue…
Source: Wikipedia (CC BY-SA)