Dust & Grim by Chuck Wendig; 2021. Hardcover (Ch-FIC)

Soon after meeting her eighteen-year-old brother, Dustin, for the first time, thirteen-year-old Molly learns their shared inheritance, a mortuary business, serves monsters. There's just one problem: the family business is a mortuary for monsters, and Molly's not sure she's ready to deal with mysterious doors, talking wolves, a rogue devourer of magic, and a secret cemetery. It's going to take all of Dustin's stuffy supernatural knowledge and Molly's most heroic cosplay (plus a little help from non-human friends) for the siblings to figure it out and save the day...if only they can get along for five minutes.