Helen Richardson was a real estate agent in 2016 who became trapped in the domain of The Spiral. While showing a house, a being implied to be Michael appeared and tricked her into going through a door that had not been there before, whereupon she spent three days lost inside of Michael's labyrinth. She managed to free herself, and after recovering from dehydration and trauma, gave a statement to the Magnus Institute. She expressed gratitude to Jonathan Sims for believing her story and promising to help her, but as she left she went through a door conjured by Michael, and was implied to be lost inside of his realm once more. (MAG 47).
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This article contains information from later episodes of The Magnus Archives, and may contain major spoilers for the setting and plot.
Some part of her survives in that realm, and appears to have usurped Michael's place as an avatar of The Spiral. When Michael was going to kill Jonathan Sims, he screams and is replaced by Helen who says she's not sure what she is, but remembers that Sims was kind to her, and helps him to escape. (MAG 101)