A sinister voice spoke from that darkness: "Step forward!"

A cold pause followed; then the sinister voice repeated its taunting statement.

"I have been watching you a long while, Zull," he said, in his low, sinister voice.

It was a sinister voice, that spoke in a weird whisper.

The Shadow was speaking in a sinister voice that seemed unreal.

He half expected to hear the tones of that whispered, sinister voice.

Unlike Bro, he has a reddish white light and a sinister voice.

The sinister voice seemed to come from the grave.

The sinister voice on the other end of the telephone warned me to stop my investigation immediately.

Instead, he caught the tones of a sinister voice.