Read every series in the right order

A Good Girl’s Guide To Murder Books in Chronological Order – Complete Reading Guide
Quick Answer (TL;DR) If you want A Good Girl’s Guide To Murder in Chronological Order, read Kill Joy (prequel novella) first, then the main trilogy: A Good Girl’s Guide to Murder → Good Girl, Bad Blood → As Good as Dead. That’s also the publication order—so you’re safe following either, but starting with the prequel…