CHAPTER NINETEEN.
MURDER ON MURDER "Out on the roof!" "Come on, Beresford!" "Hustle--you men! He may be armed!" "Righto--coming!" And following Miss Cornelia's lead, Jack Bailey, Anderson, Beresford, and Billy dashed out into the corridor, leaving Dale and the frightened Lizzie alone with the Unknown.
"And I'd run if my legs would!" Lizzie despaired.
"Hush!" said Dale, her ears strained for sounds of conflict.

Lizzie, creeping closer to her for comfort, stumbled over one of the Unknown's feet and promptly set up a new wail.
"How do we know this fellow right here isn't the Bat ?" she asked in a blood-chilling whisper, nearly stabbing the unfortunate Unknown in the eye with her thumb as she pointed at him.

The Unknown was either too dazed or too crafty to make any answer.

His silence confirmed Lizzie's worst suspicions.

She fairly hugged the floor and began to pray in a whisper.
Miss Cornelia re-entered cautiously with her candle, closing the door gently behind her as she came.
"What did you see ?" gasped Dale.
Miss Cornelia smiled broadly.
"I didn't see anything," she admitted with the greatest calm.