The Ipcress File , Series 1 : Episode 4

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Episode 4: Suspecting an American hand in Dawson's abduction, Dalby challenges General Cathcart by sending Harry and Jean to the neutron bomb test on a Pacific atoll. Harry follows a trail of clues into big trouble, while Maddox undermines Jean's trust in her colleague. With Dalby pursuing his own mission to retrieve a Russian defector, the duo fall prey to the machinations of their supposed allies.