Lots of readers are interested in the Voodoo/Hoodoo aspect of the series.
One of the most scientific books written on the topic is by Harvard-trained ethnobotanist Wade Davis.
The guy basically travelled to Haiti and investigated the creation of the legendary Voodoo Zombi!
Haitian Voodoo is a bit different from New Orleans Voodoo but just as fascinating.
Here is the cover if you're interested. It's not fiction so it has a lot of science type terms.
If you don't feel like reading it, there is also a movie version of it (of course!)
Here is the first part of the film, enjoy!