A vengeful voodoo priestess ensnares Arcane in a voodoo curse as revenge for his enslavement of Jim Kipp, who had once saved a cousin of hers from drowning. Alec helps Graham and a kindly voodoo priest save Arcane from certain death.
Killer mist from the swamp attacks Houma, putting residents in grave danger. Arcane and Alec team up to to find an antidote, while Abigail and Will hunt for a boy who may be lost in the mist. Can they stop the mist before someone gets hurt?