flash of recollection pierced the obscure muddle. She remembered now--not all of the events of that ghastly evening, but enough. Too much!
"Oh!" she murmured faintly. "Oh, Dr. Carl!"
"Yes," he nodded. "'Oh!'--and would you mind very much telling me what that 'Oh' of yours implies?"
"Why--". She paused shuddering, as one by one the events of that sequence of horrors reassembled themselves. "Yes, I'd mind very much," she continued. "It was nothing--" She turned to him abruptly. "Oh, it was, though, Dr. Carl! It was horrible, unspeakable, incomprehensible!--But I can't talk about it! I can't!"
"Perhaps you're right," said the Doctor mildly. "Don't you really want to discuss it?"
"I do want to," admitted the girl after a moment's reflection. "I want to--but I can't. I'm afraid to think of all of it."
"But what in Heaven's name did you do?"
"We just started out to go dancing," she said hesitatingly. "Then, on the way to town, Nick--changed. He said someone was following us."
"Some one was," said Horker. "I was, with Mueller. That Nick of yours has the Devil's own cleverness!"
"Yes," the girl echoed soberly. "The Devil's own!--Who's Mueller, Dr. Carl?"
"He's a plain-clothes man, friend of mine. I treated him once. What do you mean by changed?"
"His eyes," she said. "And his mouth. His eyes got reddish and terrible, and his mouth got straight and grim. And his voice turned sort of--harsh."
"Ever happen before, that you know of?"
"Once. When--" She paused.
"Yes. Last Wednesday night, when you came over to ask those questions about pure science. What happened then?"
"We went to a place to dance."
"And that's the reason, I suppose," rumbled the Doctor sardonically, "that I found you wandering about the streets in a table cloth, step-ins, and a pair of hose! That's why I found you on the verge of passing out from rotten liquor, and looking like the loser of a battle with an airplane propeller! What happened to your face?"
"My face? What's wrong with it?"
The Doctor rose from his chair and seized the hand-mirror from her dressing table.
"Look at it!" he commanded, passing her the glass.
Pat gazed incredulously at the reflection the surface presented; a dark bruise colored her cheek, her lips were swollen and discolored, and her chin bore a jagged scratch. She stared at the injuries in horror.
"Your knees are skinned, too," said Horker. "Both of them."
Pat slipped one pajamaed limb from the covers, drawing the pants-leg up for inspection. She gasped in startled fright at the great red stain on her knee.
"That's mercurochrome," said the Doctor. "I put it there."
"_You_ put it there. How did I get home last night, Dr. Carl? How did I get to bed?"
"I'm responsible for that, too. I put you to bed." He leaned forward. "Listen, child--your mother knows 

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