Angels of Death, Vol. 4 (Angels of Death, 4)

Determined to expose the weakness in the vow binding Zack and Ray together, prison guard Cathy declares it's time for the two to bid each other farewell. To that end, she continues inflicting punishments upon the pair, who find a treacherous path laid out before them. Things only get worse when, after a dose of Cathy's special "medicine," Zack's urge to kill runs rampant, and he brings his scythe to Ray's throat...!