Steve spread his hands in a gesture that seemed to Rick to indicate embarrassment. "I have gone over every step of the journey with Tom Dodd. The answer is yes. Thanks to Marks' bullheadedness, and a clerical error, there was an opportunity for an enemy to get at him on the train." The scientists waited, obviously wanting to know more. Steve elaborated. "Marks was covered by one of our men at every moment, even while he was working at the Bureau of Standards, and while he was at his apartment. The agents ate and drank the same things. Nothing has happened to them. However, when the reservations were made for the train trip, Marks specified that he wanted a bedroom. He got one, and Tom Dodd got the one next door." "Why did Marks want to travel by train overnight, anyway?" Scotty demanded. "That's getting from Washington to Newark the hard way." "I told you he was stubborn," Steve reminded. "Tom tried to talk him out of it but failed. After all, the project team members aren't prisoners. We can't use force, and we can't order them to do anything. Marks wanted to go overnight by train because he always traveled that way, he said. He insisted." Dr. Morrison said sadly, "I assure you that he is not an easy man to get along with sometimes. But we must remember that he is--or was--an extremely competent scientist. Competence like his can be forgiven many eccentricities." "Thanks to his eccentricities, we've also lost his competence," Julius Weiss pointed out. "Go on, Steve." "Right. Well, Tom specified bedrooms A and B, and by the time he got the reservations and found that he had actually received bedrooms B and C, it was too late to change because the train was sold out." "I can't see what difference that made," Rick objected. "You will. People often buy connecting bedrooms on a train, and that's what Tom had done. He planned to keep the connecting door open and remain awake all night with an eye on Marks. However, while A and B connect, B and C do not. Do I make myself clear?" "I think so," Rick agreed. "The connecting bedrooms come in pairs, A-B, C-D, and so on." "That's it. Well, Tom ran a fast check on the person who had received bedroom D, and found it was a Baltimore businessman who often traveled on the same train, going overnight to New York. So Tom didn't worry about it. Instead, he kept his bedroom door open so he could watch the corridor. He says he didn't sleep at all, and I believe him. He's one of my best agents. The occupant of Bedroom D came on the train at Baltimore and went right to bed. The night passed quietly, until it was time to get Marks up. Tom had great trouble waking him up, and he was groggy until this strange effect hit him. Rick and Scotty know. They were there." The boys shuddered, remembering Marks' condition. "But where did the opportunity to drug him come in?" Weiss asked.