"Can't even shout. Can't even cry. The Gentlemen are coming by. Looking in windows, knocking on doors... They need to take seven and they might take yours... Can't call to mom. Can't say a word. You're gonna die screaming but you won't be heard."
The Gentlemen were bald, pale humanoids that never spoke but were always grinning maliciously through metallic teeth. They wore black suits and carried satchels with scalpels in them with which to remove the hearts they required. They did not walk, but instead hovered about a foot above the ground, standing perfectly straight.
The sound of a human voice was fatal to the Gentlemen, so upon arrival in a new town they stole the voices of every inhabitant through a magical box. This forced silence had the added benefit of none of their victims were able to scream for help as the Gentlemen cut their hearts from their still-living bodies.