Rick Yancey 
Curse of the Wendigo 

Flesh-eating danger abounds in the chilling sequel to The Monstrumologist that is as fast-paced, elegant, and yes, gruesome as its predecessor (Publishers Weekly, starred review).While Dr. Warthrop is attempting to disprove that Homo vampiris, the vampire, could exist, his former fiance asks him to save her husband, who has been captured by a Wendigoa creature that starves even as it gorges itself on human flesh. Although Dr. Warthrop considers the Wendigo to be fictitious, he relents and performs the rescuebut is he right to doubt the Wendigos existence? Can the doctor and Will Henry hunt down the ultimate predator, who, like the legendary vampire, is neither living nor dead, and whose hunger for human flesh is never satisfied? This second book in The Monstrumologist series explores the line between myth and reality, love and hate, genius and madness.