This is for book 3, Infinite!
The mistake I made was not reading this one right after Afterlife. There were several months between readings, enough to where I started this like “wait who‘s that? What happened?” Infinite starts right where Afterlife left off, with no “last time in Ghostland” or anything. I tried searching a synopsis online and couldn‘t find anything. So, I caught up as best I could with my fuzzy memory. (Cont in comments)