Blanchard was not given to outbursts. But his lips were grim as he said, "We are waiting for you to talk sense, Pardeau." "The confusion comes from your not allowing me to tell it as I wished. There is a gap between Lenster and Hillerman; one which--with your permission--I will fill." "Talk, man! Talk!" "You have all heard of Formula 652, known also as the Wyckoff Chemical Transformation Process." There were expressions of both understanding and bewilderment. Noting these, Pardeau said, "For those of you who haven't made a point of looking into the thing, I'll explain. Wyckoff, in case you don't recall, was a chemical engineer of more than average ability who stumbled onto this formula before he died, most regretfully, four years ago, in 1984." Leiderman continued to scowl. "We all know each other, Pardeau. Call a spade a spade. Wyckoff was a reactionary scoundrel whom you did away with for reasons of security." "Precisely," Pardeau said. "In its essence, the formula is a process for taking over a man's brain--his body--his personality." "You mean--" Pardeau refused to be interrupted. "We were of the opinion that Wyckoff, though he and Lenster were great friends, was not able to impart his knowledge to the latter. We took him into custody shortly after he perfected the formula and were fortunate in persuading him to give it to us." "But he gave it to Lenster also?" "We were certain, at the time of his death, that he had not been able to do that--we are still certain." Keeley, with a gesture, requested the floor. "I wonder if you could go into a little more detail concerning the formula--for those of us who--" "Of course," Pardeau said. "The formula is a combination of six chemicals and the process of transformation is relatively simple, yet highly dangerous to both subjects involved. It means sure death for the proposed host, and if not delicately handled will also result in death for the usurper. The transformation requires three hours to perform. Once completed successfully, the usurper can never return to his own body. It must be destroyed. Also, the mentality of the host vanishes after it is pushed from its original brain tissue through the influence of the formula." "Then if Wyckoff didn't give the formula to Lenster, it was stolen from our vaults--or wherever it was kept?" "Exactly. Certain investigations I have made prove beyond doubt that Lenster got to my Deputy, Hillerman. I never considered Hillerman very bright, but I thought him to be honest and loyal. But beyond all doubt, with his aid, Lenster stole the formula--possibly got it verbally--and used it to take Hillerman's body from him." Pardeau smiled grimly. "Therefore, gentlemen, we have a traitor in a high place. My Deputy of Vital Intelligence." * * * * * Pardeau sat silent now, seeming to enjoy the fear he had engendered in his colleagues--sat silent until Leiderman said, "You've arrested him of course." "No. I have not."