But last night I sat late in my study, which is immediately under Miss Mannering's apartment, and to my surprise I not only heard the flageolet distinctly, but satisfied myself that it came from the lake under the window.

Curious to know who serenaded us at that unusual hour, I stole softly to the window of my apartment.

But there were other watchers than me.

You may remember, Miss Mannering preferred that apartment on account of a balcony which opened from her window upon the lake.

Well, sir, I heard the sash of her window thrown up, the shutters opened, and her own voice in conversation with some person who answered from below.