sentences:  To prove his point, Harry locks himself in a safe in the courtroom and breaks out a few minutes later, after which Bess explains to Harry's mother that safe locks are designed to keep thieves out, not in.Vindicated, Harry then goes to see Von Schweger, who finally has responded to his queries, but learns from Von Schweger's assistant, Otto (Torin Thatcher), that the magician died two days earlier.Otto reveals that Von Schweger summoned Harry to ask him the secret of "dematerialization," a feat he accomplished once but could not repeat.