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The Dagger Affair(1966)
(The fourth book in the Man From U.N.C.L.E. series)
A novel by David McDaniel
Solo and Illya desperately search for the diabolical machine that could end human life on Earth, in a new U.N.C.L. E. adventure, based on the exciting MGM-Arena TV series. "Tell us all about Dagger!" That was the command thrown at Napoleon Solo and Illya Kuryakin by the unseen THRUSH agents who kidnapped them and interrogated them with lie detectors. And from each U.N.C.L.E. agent came the same answer: "We know absolutely nothing of Dagger."
Used availability for David McDaniel's The Dagger Affair