I enjoyed the book. It is an 88-page novella/short-story type of thing (which I don't usually care for). Kind of a snippet of two characters guaranteed to be trouble, Sarah from Fright Court and Jane from Magic and the Modern Girl, Girl's Guide to Witchcraft, and Sorcery and the Single Girl.
I suspect readers not familiar with the characters would not enjoy. I read kindle version which has about 70% story and then extras including generous excerpts from author's other books.
Very unlikely to be pivotal to either character or series. But some funny moments making it worth the read.