the radio is a story about a ex British spy named jack , jack powell have a intelligent mind and dangerous skill , but one little mistake made his career was destroyed , not only lost his career but he also left by his fiance who was pregnant with his child . With that past , jack choose to become an ordinary people with being a radio announcer . But it turns out to one biggest mistake in his life which make his past come back again . one day a mysterious caller kidanpped his daugther siena, he threatened to kill his daughter if he can't find the caller and solve the puzzle in 12 hours . Jack suspects one of four people from his past has kidnapped his daughter , eventually jack must fight the caller with his intelligence and accept the fact that he will lost his loved ones for the second time .