“The baron must have turned on the light in his room. It is just above us.”

“That must have been the noise you heard,” said Wilson. “Perhaps they are watching the fence also.”

Then there was a second whistle, softer than before.

“I don’t understand it; I don’t understand,” said Sholmes, irritably.

“No more do I,” confessed Wilson.

Sholmes turned the key, drew the bolt, and quietly opened the door. A third whistle, louder than before, and modulated to another form. And the noise above their heads became more pronounced. Sholmes said:

“It seems to be on the balcony outside the boudoir window.”

He put his head through the half-opened door, but immediately recoiled, with a stifled oath. Then Wilson looked. Quite close to them there was a ladder, the upper end of which was resting on the balcony.

“The deuce!” said Sholmes, “there is someone in the boudoir. That is what we heard. Quick, let us remove the ladder.”

But at that instant a man slid down the ladder and ran toward the spot where his accomplices were waiting for him outside the fence. He carried the ladder with him. Sholmes and Wilson pursued the man and overtook him just as he was placing the ladder against the fence. From the other side of the fence two shots were fired.