Imagine you’re sitting at your desk late at night investigating reports of suspicious individuals in the hopes of ultimately tracking down murderers, kidnappers, and other violent criminals. Except for the crickets chirping outside, it’s completely quiet as you tap keys, examine clues, and search through text messages, photographs, police reports, and other bits of evidence spread out over your desktop.

Then, behind you, from somewhere from within your silent, darkened house, there’s a muffled thump, so faint you almost aren’t even sure you heard it.

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