"Clara!" she gasped. "Why, that's—"

We both started and looked at the front door.

"Listen!" Miss Cooper whispered.

Light, stealthy footsteps sounded upon the porch. Next instant the knob was being slowly turned by a cautious hand.

CHAPTER XII

THE CIPHER

We sat rigid and breathless, with our eyes glued to the slowly revolving door-knob. At last a faint click announced that the latch was released. Then the door opened a few inches, to reveal the slender figure of Alexander Burke.