Ace, New York, 1965, 1^st ed/paperback original.  G-571.  Based on the exciting MGM-Arena TV series.  MMPB, 159 pages.  Near fine; tight binding; light edge and cover wear, light creases on rear.  Interior clean and unmarked with tanned pages.  Agents Napoleon Solo and Illya Kuryakin.  ‘”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.”  “You appear to be telling the truth,” said the hidden voice.  “A pity….”  But it was more than merely unfortunate that the U.N.C.L.E. organization had never heard of DAGGER.  For the secret behind that name was an insane plot for mass murder – the murder of the human race!’ (from rear wrap)