The laugh came again, this time as a sinister whisper.

The Shadow's voice was a quiet, commanding tone, different from his sinister whisper.

Only one living being could voice that strange, sinister whisper.

He spoke, and his voice was a sinister whisper.

His voice was no more than a sinister whisper, yet it brought a prompt reply from the other end of the wire.

Dugley heard a sinister whisper: a command for him to speak.

It had changed from a dry, crisp note to a sinister whisper.

His voice was ominous - it came in a low, sinister whisper.

His voice dropped even further, becoming a sinister, barely audible whisper.

The laugh that came from the phantom form was no more than a sinister whisper.