Eve Dallas is the tough lieutenant hot on his trail, but this is unlike any case she's ever been assigned—or any killer she's ever pursued. A police sketch based on eye-witness testimony reveals the killer has green skin, swollen red eyes, goblin ears, and a dislocated jaw-structure that defies the human form. Is it a mask? Is it make-up? Or is the explanation more sinister? Dallas faces off against multiple suspects—all of them students of medicine capable of precisely slicing the ears, noses, and eyes of the three victims. But who had the motive? More importantly, what kind of rogue science are these healers practicing?