Hartson Brant shook his head. "No one can claim total knowledge of body chemistry, obviously. Just the same, the elements to be found in the body, and the proportions in which they occur, are well known. I said the possibility has not been entirely eliminated, but it seems unlikely that chemical interference caused the disruption." "What does that leave?" Steve inquired. The scientist shrugged. "I can't even guess. Physical interference, perhaps. There is also a possibility, which is very difficult to explore, that the ailment was caused within the minds of the scientists by some catalytic agent, or by some psychic trauma that we can't even imagine." Rick and Scotty exchanged glances. They had seen the ailment at work, and even its effects were almost beyond description. Its cause was hard to imagine. "But, to continue. Steve recognized the possibility that the ailment was caused by some outside source. Call it an enemy source, if you prefer. He acted to get the remaining team members beyond reach of the enemy by smuggling them to Spindrift. He succeeded with Dr. Miller--excuse me, Dr. Morrison. He did not succeed with Dr. Marks. What does this suggest?" "That hiding Dr. Morrison was an effective preventative," Steve Ames concluded. "If he is hidden." Rick said the words before he even thought. "What do you mean, Rick? No one outside the family or the project knows of his presence!" Julius Weiss exclaimed. Steve held up his hand. "Hold it a minute. We'll get to that point in its proper turn." Hartson Brant picked up the threads again. "We will assume for the moment that Steve's statement is correct, and that hiding Dr. Morrison was a preventative. I know Steve doesn't accept this fully, but we must use assumptions since we have no facts of consequence. If the assumption is correct, then we have to accept the fact that enemy agents are interested in the project. And we must also accept that they have some means of creating a mental block by remote control." Rick stole a glance at Parnell Winston. The cyberneticist was sitting quietly, his bushy eyebrows knitted thoughtfully. Winston hadn't said a word. Hartson Brant paced the floor as he went on. "We now have one slight bit of additional information that supports the theory of enemy interference. You are all aware of what happened to Dr. Marks this morning. He is in the hands of Constantine Chavez, who is in touch with the physicians in charge of the other team members. Dr. Chavez is of the opinion that Dr. Marks' mental injury was caused by physical means, although he cannot say how. He also states, although there seems to be no connection with the mental injury, that Marks was drugged." Parnell Winston spoke for the first time. "Steve, if Chavez says Marks was drugged, we can accept it. How could it have happened?"