Then the deadly eyes suddenly vanished.
There was a thud, as if some one had leaped down from a chair on which he had stood.
At the same instant Merriwell sprang up and attempted to open the door.
It was locked.
On entering the room Morgan had left the key in the lock, and this key had been softly turned by the mysterious eavesdropper.
There was the sound of fleeing feet in the corridor and a soft laugh, which trailed away and grew fainter in the distance.
Frank Merriwell stepped back from the door and flung his shoulder against it with fearful force.
With a splintering crash, the door gave way before the shock, and Merry staggered into the corridor. He was followed by Starbright and Morgan.
Recovering his equilibrium, Frank straightened up and whirled to follow and overtake the mysterious unknown if possible.
The man of the midnight eyes had disappeared.