The Case of Charles Dexter Ward by H.P. Lovecraft
Another book from the way back machine, The Case of Charles Dexter Ward is by an absolute master of horror and dark fantasy, H.P. Lovecraft. The novel wasn't published until after his death, but is now looked upon fondly by fans of Lovecraft. Definitely fun if you're into some good ol' fashion necromancy.
Scare Factor: 2 - Creepy, and good, but not that scary. Definitely is something that everyone can read.