What did Isabelle want?" Jace asked. Alec hesitated. "Isabelle says the Queen of the Seelie Court has requested an audience with us." "Sure," said Magnus. "And Madonna wants me as a backup dancer on her next world tour.
Cassandra Clare (2010). “Cassandra Clare: The Mortal Instrument Series (3 books): City of Bones; City of Ashes; City of Glass”, p.543, Simon and Schuster
