吉米难以向女儿说出她母亲去世的真相,保罗面临日益恶化的帕金森症状,而加比则面临离婚问题,与此同时,他们的个人生活和职业生涯变得更加交织和复杂。。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."。