Griffin frowned. "I guess I missed that. What did you pick up?"
"He's supposed to meet a Soviet agent tonight, and he's afraid he'll be caught. He doesn't know what happened to the first three, and he won't know what will happen to Number Four tonight.
"We'll keep him around as long as he's useful. He's not a Bohr or a Pauli or a Fermi, but he—"
MacHeath stopped himself suddenly and came to a dead halt.
"My God," he said softly, "that's it."
His hunch had hatched.
After a moment, he said: "Harry is getting back from the target end of the tube now, Bill. He can't pick me up, so beetle it down to the tool room, get him, and get up to the workshop fast. If I'm not there, wait; I have a little prying to do."
"Can do," said Griffin. He went toward the elevator at an easy lope.
David MacHeath went in the opposite direction.