Gender-less book

Is there any books that use 'they', 'them' and 'theirs' instead of 'he', 'she', 'him', 'her', 'his' and 'hers'?

I wanna see what genders people happen to assign the characters.

What was an oddity against the background of generally using singular correctly cannot be made a convincing argument for widespread and continual abuse of the plural that happens now. Exactly what do you think you're gaining by dropping carefully selected passages in a corpus of English Lit where the overall correct usage is clear?