Carswell has discovered a book titled "Induction of Psychoneurosis by Conditioned Reflex under Stress" – IPCRESS – which he believes explains what has happened to Radcliffe and the other scientists. Some days later, it becomes clear that while Radcliffe is physically unharmed, his mind has been affected and he can no longer function as a scientist.
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Subsequently, another CIA operative threatens to kill Palmer if he discovers that the death was not a mistake. The exchange goes as planned but, as they are leaving, Palmer shoots a man in the shadows who turns out to be a CIA agent. There they encounter Grantby and a deal is struck for Radcliffe's return. Dalby then points out that the paper on which Grantby had written a false phone number is the programme for an upcoming military band concert.
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Suspecting that Radcliffe is being held in a certain disused factory, Palmer orders a search, but nothing is found except a piece of audiotape marked "IPCRESS" that produces meaningless noise when played. Housemartin is arrested later but, before he can be questioned, he is killed by men impersonating Palmer and Carswell. Using a Scotland Yard contact, Palmer locates Grantby but, when Palmer tries to stop Grantby getting away, he is attacked by Housemartin. Palmer is also introduced to and befriends Jock Carswell. Palmer is then introduced as a replacement for the dead security escort.Īfterwards, Dalby briefs his agents that the main suspect is Eric Grantby and his chief of staff, codenamed "Housemartin", and tells the team to find out where they are at present. He threatens Dalby that his group will go if Radcliffe cannot be recovered. Ross suspects that Radcliffe's disappearance is connected to the fact that sixteen other top British scientists have inexplicably left their jobs at the peak of their careers. Harry Palmer, a British Army sergeant with a criminal past, now working for a Ministry of Defence organisation, is summoned by his superior, Colonel Ross, and transferred to a section headed by Major Dalby.
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A scientist called Radcliffe is kidnapped from a train and his security escort killed.