[Answered ]-Django get authors in serie through book-object

You can work with:

Author.objects.filter(book__serie=my_serie)

So if my_serie is Conan, it will return as authors Poul Anderson, Leonard Carpenter, Lin Carter, etc. as Author objects.

If an Author wrote to multiple books in the my_serie, it will appear multiple times. You can prevent that with .distinct() ^[Django-doc]:

Author.objects.filter(book__serie=my_serie).distinct()