Killjoy takes us back to the world of a good girls ‘s guide to murder. This is a prequel story that tells us when our main character decided they were gonna look into this murder. It all starts with a how to host a murder party thrown by a friend. This was a novella put out for world book night, and it was a nice story to the series. I didn’t like book number three so revisiting and seeing the things I loved about the main character from book number one was perfect.