There's some sort of a speech block here, Frank thought as he bent over and lowered the sheet. "I'm just doing a little checking," he said casually. "No cause for alarm."

"I am not—alarmed."

Corson frowned slightly as he concentrated on his work. He went over the patient's torso, up and down, back and forth. At times he straightened to rest his back and stared down into the calm, expressionless face on the pillow.

Twenty minutes passed, during which time Frank Corson checked and rechecked every inch of the man's torso. When he finished, he slowly folded his stethoscope and pulled the sheet back into place. He stared at the patient for a full minute without bringing the slightest change in the empty expression.

"Sleep well," he said, and walked slowly away.

Back in the street, five minutes later, he dropped into the seat beside Rhoda. She eyed him questioningly and when he did not respond, she asked, "Everything all right?"

"I don't know. I guess so."

"What do you mean—guess so? It is or it isn't."

"There was something about a patient's heartbeat. I passed it over on the first examination, but it stuck in my mind. That's why I had to go back."

"And ...?"