So, with the last book announcement I got back to wondering (and I hope you don't mind sating my curiosity) what the hell is a ninth? Is that a title? Why are there so many of them?

Lmaoo anon it’s really funny to me that you’re so curious about a book series you don’t actually wanna read. Of course I don’t mind though! There are nine “houses” that are actually nine planets, so the ninth refers to the ninth house. They’re also kinda themed, so you have for example the military house, the history nerd house, the hedonist cannibal house, religious nutjob house number one, religious nutjob house number 2… You know how it is