Madame Theodora Sofi is a medium who lets Nimrod contact John in the fourth book. Unlike most mediums, her powers are quite genuine. At age 18 she went to Tibet to study with her brothers. Her powers helped her contact Leo Politi, the Ka servant, who was able to receive the call and communicate with one another.
She is a tall Italian woman with a long sinuous neck, a voluptuous head of red hair, a big nose, and large tinted glasses.