Heart aching young adult novels about/with cats as a major plot point?

I need cat books. I love cat books. I already have read some dog young adult novels but I want some cat ones. Can be fiction or non-fiction. No older adult novels or cats that are on the side. I want cats as either a major character or a major plot point (MC can be human but has a cat sidekick or something, that's fine as well).

Thank you!