Read This! The Monstrumologist by Rick Yancey
Will Henry is the assistant to Dr. Warthrop, a monstrumologist who studies those dark creatures who haunt our nightmares. When a strange corpse is delivered to their doorstep Will Henry and Dr. Warthrop discover and attempt to destroy a pod of Anthropophagi living in their home town. Warning! This book is not for the easily scared (like me).