From the other side came a confused murmur of voices, as if many persons were talking in hushed tones.
Presently they became quite still and then there arose the sound of music. It was a slow and somber strain, as from an organ gently played.
Nick was crouching against the door, among the folds of a curtain which could be drawn across.
Suddenly he heard a slight sound behind him. He turned noiselessly.
A white figure flitted across the room.
Nick was at one end of the folding doors, and the figure passed to the other end and into the corner beyond.
There it suddenly vanished.
The light was so dim that Nick could not tell exactly what had happened.
It certainly seemed as if the figure had gone straight through the wall.
About a minute later another form appeared in the same way. It crossed the room, and vanished.