It's Friday, and Arthur Penhaligon has defeated four of the seven trustees, but his week isn't getting any easier. The Piper's New Nithling Army controls most of the Great Maze, and Superior Saturday is creating danger wherever she can. Worse still, Arthur is cut off from his home and loved ones, and risks being trapped in the House for ever. Lady Friday tempts Arthur with an unexpected offer - but it is a cunning trap for the Rightful Heir to the Kingdom, or a chance he must seize before Superior Saturday or the Piper snatch it first? Who will win the race to discover the secret of the Middle House?