Alya, Nino, Adrien, and Marinette have a sleepover that they will remember for a lifetime. Alya brings an Ouija board and the decide to use it.
Suddenly, Marinette's eyes are changing from blue to horrifying black, and she seems to have a terrible head ache. There is a black aura around her and Alya, Nino, and Adrien thinks something is wrong with her.
What happened to Marinette? Can they get her back to her old self?