Anna Dressed in Blood is one of the creepiest YA books I've read, and if you need a read for Halloween, this is the one I suggest. Ready yourself for some gory details, while also trying to solve a ghost's murder mystery. As far as scary novels, this one has all the tropes you could want, but with a side of romance as well. Delve into the world of ghosts and monsters with this spooky read.
Publisher description:
For three years, seventeen-year-old Cas Lowood has carried on his father's work of dispatching the murderous dead, traveling with his kitchen-witch mother and their spirit-sniffing cat, but everything changes when he meets Anna, a girl unlike any ghost he has faced before.