All this was done in a moment’s time, and the two trackers were headed for the entrance.

The gate was ajar two or three feet.  With turbulent hearts, they stole through.

“Keep along the wall,” whispered Lorry, “and trust to luck.  The castle is to the left.”

Without hesitation they crept over the noiseless grass, close beside the wall.  Directly they heard sounds near at hand.  The abductors were binding and chloroforming the guard at the arbor.  After waiting for some moments they heard the party glide away in the darkness, and followed.  The body of the guard was lying just outside the mouth of the arbor, and the odor of chloroform was almost overpowering.  Once inside the long arbor, the Americans moved slowly and with greater caution.  There was a dim light in a basement window ahead.  Toward the front of the castle and in the second story a faint glow came from another window.  They guessed it to be from the Princess’ room or from that of the countess.

At last they saw four figures steal past the dim basement light.  One of them halted near the window, and three crept away in the darkness.  Presently one of them returned, and all activity was at an end for the time being.  How near it was to two o’clock the watchers could not tell.  They only knew that they were within twenty-five feet of Geddos and Ostrom, and that they would not have long to wait.

Soon a bright little blaze of light crossed the basement opening.  Then it returned, crossing a second time, and a third.  All was still again.  The soft shuffle of a foot, the rustle of arbor vines, and the form of a man crawled up to the window.  With inconceivable stealth and carefulness it glided through the aperture, followed by a companion.

Lorry and Anguish were at the opening a second or two later, lying flat on their stomachs and listening for sounds from within.  The dim light was still there, the window was open, and there was a sound of whispering.  Lorry raised his head and peered through, taking calculations while the light made it possible.  He saw an open door on the opposite side of the low room, with steps beyond, leading upward.  Between the window and the door there were no obstacles.  Up those steps he saw three men creep, the leader carrying the dim light.  The door was left open, doubtless to afford unimpeded exit from the building in case of emergency.  Harry Anguish touched Lorry’s arm.

“I took the two pistols from that Vienna man out there.  We may need them.  Here is one for yourself.  Go first, Lorry,” he whispered.

Lorry stuck the revolver in his coat pocket and gently slid through the window to the floor below.  His friend followed, and they paused to listen.  Taking Anguish by the hand the other led the way straight to the spot where he remembered seeing the door.