Black Butler Circus, Murder, Atlantic Summery?

Heyaa~ I’ve recently started watching Black Butler, I’m doing a canon watch, and I’ve watched the canon episodes of season one. I know what order to watch the rest of the series, but I literally can’t find Book of Circus, Book of Murder, or Book of Atlantic anywhere for the life of me. I've searched for weeks.

Public School Arc and Emerald Witch Arc are on Crunchyroll in my region, so I can at least watch those there. I was just wondering how vital Circus, Murder, and Atlantic are? Are there important plot points I need to know, and can I get by without watching them if someone could please summarize them for me?

I really, really want to continue watching it.

Thanks in advance!