I probably wouldn't even have noticed if you hadn't pointed it out! I turn off (or at least significantly tone down) my eye for grammatical/spelling errors when I'm 'off duty', and I'm especially forgiving of friends. Anyway, it would be hypocritical of me to criticise others because I know for a fact that I make a lot of errors in my posts (I'm especially fond of leaving random words out of sentences for no particular reason ).
It must mean that it's the club of the rotters (so multiple rotters own, or are members of, the club). Does that in any way fit in with what you're reading?
Great reviews, especially of The Guest Cat and Violet to Vita. I don't know anything about Violet and Vita, but I love the excerpts you included in the review. It sounds like a passionate read. And I really want to get to The Guest Cat soon! Now that I know someone who has read it, can you please tell me (in spoilers, I guess) if it has a sad ending? I've been worrying about that.