Thread:FantasyAlpaca/@comment-44944057-20200128041307/@comment-44807868-20200128053809

Hello, welcome to FANDOM! :)

To answer your question, "series" is both plural and singular so just "series" will do, "serieses" isn't an usual use.

Also, it looks you're a huge books fan so I'd recommend having a look around book-related wikis and join them if you're interested, there's lots of them! Keeper of the Lost Cities Wiki, Riordan Wiki, and The Land Of Stories Wiki are among them. And of course, best of luck with writing your book!