But there it was again, the curious tone in his voice when he said Benton's name.

Thornhill looked at him again, struck by the curious tone in his friend's voice.

His voice had a curious tone, as if he could not believe that his brother was no longer among the living.

There was a very curious tone in his voice.

Gina's voice took on a curious, more distant tone.

There is also," he said in a curious tone, "another argument entirely.

There was just something about the urgency in your father's voice- his curious tone- that concerns me.

I remember/ the old man said in a curious, expressionless tone.

Dip asked in such a curious tone that Thian knew something was wrong.

The captain turned back to regard his second officer, wondering at the curious tone she had used.