I read the first three books of this series together in a collection. The series is on Kindle Unlimited. It's a paranormal mystery/romance/urban fantasy with tons of snarky banter among the 8 main characters, 6 of which make up a family. (50+ yr old dad, 4 brothers and 1 sister, all 20-somethings - mom died 10 years ago) plus the sister's long-time best friend since kindergarten (who might as well be family) plus her new boyfriend. The family all work as grim reapers, transporting souls to the afterlife. They are all human with a bit of extra supernatural-ness that allows them to see and interact with the souls of the departed. The bad guys are wraiths (like the guards of Azkaban - they eat souls) and ghouls (witches that prolong their life by eating souls.)
Overall, the series is very funny because of the boisterous interactions among the siblings.
In the first book, there are extra wraiths in town, and a bad ghoul controlling them.
Second book shouldn't have so many wraiths, but there are still a ton around. Turns out there's another plot afoot.
Third book reveals a family enemy, a great big lie about the mom, and yet more wraiths in the picture, plus some gargoyles.
As the series progresses, little things about why the sister is being targeted by so many groups are slowly revealed.