https://en.wikipedia.org/wiki/Binjamin_Wilkomirski
His fictional 1995 memoir, published in English as Fragments: Memories of a Wartime Childhood, was debunked by Swiss journalist and writer Daniel Ganzfried in August 1998. The subsequent disclosure of Wilkomirski's fabrications sparked heated debate in the German and English-speaking world.
see also
https://www.scribd.com/book/249307486/Mistakes-Were-Made-but-Not-by-Me-Third-Edition-Why-We-Justify-Foolish-Beliefs-Bad-Decisions-and-Hurtful-Acts (accessible via scribd)
