Legends of the Undead by Justin Craig is one of the books that Schanke checks out of the library to consult in Close Call. It is the one that he is actually shown reading, from which passages are heard in voiceover.
In Close Call, Nick's extraordinary speed in saving Schanke from a suspect's bullet draws his suspicion, and Schanke decides to investigate his partner's past. His notes prompt a joke about vampires from a uniformed officer; and Schanke is sufficiently impressed by the possibility to turn his eyes in that direction. He provides himself with a stack of reading material so that he can learn more about vampires.