Operation Racquetball

To understand why Mike Green had begun to scream, one must merely look at the events of a few seconds earlier.

Then, an old man had sat in a windowless van, ensconced in soundproofing, and raised a small radio to his lips. "Begin," he declared tonelessly, "Operation Racquetball."

At the other end of the line, an engineer flipped a switch, sending a signal to the equipment in the parking garage.

The speakers blared, playing at the resonant frequency of intracranial fluid. The sound was inaudible to human ears, but it could knock out an entire building in ten seconds without any permanent injury.

Inside the van, the old man held his head and watched through security cameras as the building shut down. He saw entire offices abruptly stop and collapse, clutching their heads. When the tone stopped, he ordered, "Continue the operation."

Another van pulled up, at the entrance to the building. A dozen operatives briskly walked out of the back, and entered the building efficiently.

The police showed up moments later.