Come in, pull up a Ouija board, and grab a seat for a tour around Madame Dorothea's psychic abode.
She has a variety of posters hanging: zodiac signs, Chinese symbols, and the like. These are the psychic's equivalent of cute kitten posters with the inspirational phrase, "Hang in there, baby."
One poster of a hand says In Manibus Fortuna, which means "Upon by the hands of fortune," which sounds an awful lot like a MST3K episode we remember…
Okay, so Madame Dorothea isn't a total hack. And she can make a steaming pot of tea and a mean cucumber sandwich, which they all daintily munch on while talking about vampirism and lycanthropy.
After tea, they skip the crumpets and head straight for tealeaf reading, which is our kind of party.
Madame Dorothea sees "violence" and "love with the wrong person" (7.69) in Jace's cup and just a pile of green mush in Clary's cup.
Wait. Why doesn't Clary have a future in a teacup? Madame Dorothea believes that someone might have put a block on her mind.
This fortune-telling emergency requires Madame Dorothea to bust out the Tarot cards. She uses her own personal deck, which was hand-painted by Clary's mother.
Clary draws the Ace of Cups, and Madame Dorothea launches into a story about Clary's mother's past.
She says that not only was Jocelyn a Shadowhunter, but their apartment building was supposed to be a Sanctuary from Valentine (remember him?).
Hmm. It sure doesn't look like that worked out too well.
The plan, if it had worked, would have been for Jocelyn to escape through the Portal in Madame Dorothea's apartment. The Portal's a door set into an exterior wall between two windows, so it doesn't just go outside; it could teleport someone anywhere.
Curious to know where her mother would have ended up, Clary yanks the door open and tumbles through.
That's pretty much like pushing a giant red blinking Emergency Self-Destruct button, but we'll go with it.