"Debut novel"

Cyia

Rewriting My Destiny
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Kind of an odd question I guess, but if a writer publishes in more than one genre under more than one name is the 1st book published with a new name considered the pen name's "debut" novel?

If Jane Doe published 3 books in fantasy and then wrote a dark thriller as John Smith, would the thriller be sold as John Smith's debut novel?

(Totally hypothetical here, I'm just curious after seeing mention of authors using multiple pen names.)