destroy() {
    // Clear the queue
    // this.q.clear();
    // this.q = undefined;
    this.manager && this.manager.destroy();
    this.book = undefined; // this.views = null;
    // this.hooks.display.clear();
    // this.hooks.serialize.clear();
    // this.hooks.content.clear();
    // this.hooks.layout.clear();
    // this.hooks.render.clear();
    // this.hooks.show.clear();
    // this.hooks = {};
    // this.themes.destroy();
    // this.themes = undefined;
    // this.epubcfi = undefined;
    // this.starting = undefined;
    // this.started = undefined;
  }
Remove and Clean Up the Rendition