Witch in time

"Years back, a blood transfusion with a member of the undead left Christopher Cséjthe a half-vampire. Since that time, he's gone mano y monster with zombies, werewolves, master vampires, and creatures from the Cthulhu Lagoon-not to mention an immortal Nazi, an ancient Babylonian demon, a six-thousand-year-old necromancer, voodoo queen Marie Laveau, the mad monk Rasputin, and a couple of the Great Old Ones. As founder of After Dark Investigation...