It was a sibilant tone, one that carried a spectral touch.

So had that laugh begun - in a rising, sibilant tone.

A soft laugh came in sibilant tones from the gloom on the near side of the table.

Then, above him, he heard the sibilant tones of a whispered taunt.

"The process was very simple," came The Shadow's sibilant tone.

At last, in sibilant tone, he ordered: "Stay as you are until this case is settled.

The Shadow's command was a whisper, in the sibilant tone which he had used the day before.

In the murderer's very ear whispered a sibilant tone that froze him.

The room seemed empty, until a sibilant tone told that a presence remained there.

"It happens to all of us," the student said in sibilant Andorian tones.