The Trance Room is a room inside Chrestomanci Castle that is used by the Spirit Travellers working for the current Chrestomanci. It was also used to hold Mordechai Roberts' body while he was spirit travelling for Ralph Argent A.K.A. The Wraith. By having Mordecai's body in the Trance Room Mordecai's spirit returned to his body there instead of the place he had set out from, a garret on Baker Street. His spirit returned with the items he was supposed to be smuggling for the Wraith. He was, therefore, caught with the evidence in hand. His minder an, elderly woman, was captured as well.