Probably, one should not do research while writing the novel in question, but what the hell. Soon-to-be-current reads include:
Food for the Dead, a folklorists look at vampires in New England (mostly for the chapter on ghouls..)
A History of Cannibalism and
Cannibal Killers: murderers who kill and eat their victims.
To be fair, most of this research will probably go into the sequel but it is nicely weird to be researching this for what is still, in my head, YA.