在时间尽头，面对宿命的选择，博士与同行者勇敢探索未知，挑战时间的无常。家庭的秘密免费阅读

　　The Doctor faces the end of his life as the Master's plans hurtle out of control. With the sound of drums growing louder, and an ancient trap closing around the Earth, the Doctor and Wilf must fight alone. But sacrifices must be made, and the deadly prophecy warns: "He will knock four times."