Her step made no noise, despite hard-soled boots and a stone floor that threw back sharp echoes.

Neubles of course store a tremendous energy which can be released if they're broken, but fortunately they produce the sharpest echoes of all.

Gomez darted across the street, her mud-splashing footsteps answered by sharp echoes.

Theresa's boots clicked sharp echoes from the hallway.

"No." The last of the footsteps retreated to faint, sharp echoes on the slabwork outside.

It seemed to be somewhere underground, a vast conical space filled with sapphire light and the sharp echoes of industry.

Trapped between was a sandwich of air, filled with sharp echoes.

The Shadow's next shots brought back sharp echoes, telling that the bullets had encountered rocks.

Now the ledge was casting back sharp echoes.

Intercepting the sharp echoes, he quickly put together a composite of the girl's features.